The largest princely state in Kerala by area was:

Travancore
Cochin
Kolathunadu
Zamorin's Kozhikode

The correct answer is A) Travancore.

Travancore was a princely state in India that existed from the 18th century until 1949. It was located in the southern part of the Indian subcontinent, on the Malabar Coast. The capital of Travancore was Thiruvananthapuram, which is now the capital of the Indian state of Kerala.

Travancore was one of the largest princely states in India, with a population of over 3 million people in the early 20th century. The state was ruled by a hereditary monarchy, and the Maharaja of Travancore was one of the most powerful rulers in India.

Travancore was a prosperous state, and its economy was based on agriculture, trade, and industry. The state was also home to a number of important cultural and educational institutions.

In 1949, Travancore merged with the princely state of Cochin to form the state of Travancore-Cochin. In 1956, Travancore-Cochin merged with the Malabar district of Madras Presidency to form the state of Kerala.

B) Cochin was a princely state in India that existed from the 14th century until 1949. It was located in the southern part of the Indian subcontinent, on the Malabar Coast. The capital of Cochin was Ernakulam, which is now a part of the Indian city of Kochi.

Cochin was one of the smaller princely states in India, with a population of around 1 million people in the early 20th century. The state was ruled by a hereditary monarchy, and the Maharaja of Cochin was one of the most powerful rulers in India.

Cochin was a prosperous state, and its economy was based on agriculture, trade, and industry. The state was also home to a number of important cultural and educational institutions.

In 1949, Cochin merged with the princely state of Travancore to form the state of Travancore-Cochin. In 1956, Travancore-Cochin merged with the Malabar district of Madras Presidency to form the state of Kerala.

C) Kolathunadu was a princely state in India that existed from the 12th century until 1949. It was located in the southern part of the Indian subcontinent, on the Malabar Coast. The capital of Kolathunadu was Thrissur, which is now a part of the Indian state of Kerala.

Kolathunadu was one of the smaller princely states in India, with a population of around 500,000 people in the early 20th century. The state was ruled by a hereditary monarchy, and the Raja of Kolathunadu was one of the most powerful rulers in India.

Kolathunadu was a prosperous state, and its economy was based on agriculture, trade, and industry. The state was also home to a number of important cultural and educational institutions.

In 1949, Kolathunadu merged with the princely state of Travancore to form the state of Travancore-Cochin. In 1956, Travancore-Cochin merged with the Malabar district of Madras Presidency to form the state of Kerala.

D) Zamorin’s Kozhikode was a princely state in India that existed from the 14th century until 1949. It was located in the southern part of the Indian subcontinent, on the Malabar Coast. The capital of Zamorin’s Kozhikode was Kozhikode, which is now a part of the Indian state of Kerala.

Zamorin’s Kozhikode was one of the smaller princely states in India, with a population of around 200,000 people in the early 20th century. The state was ruled by a hereditary monarchy, and the Zamorin was one of the most powerful rulers in India.

Zamorin’s Kozhikode was a prosperous state, and its economy was based on agriculture, trade, and industry. The state was also home to a number of important cultural and educational institutions.

In 1949, Zamorin’s Kozhikode merged with the princely state of Travancore to form the state of Travancore-Cochin. In 1956, Travancore-Cochin merged with the Malabar district of Madras Presidency to form the state of Kerala.