The administrative headquarters of the Dakshina Kannada district:

Mangaluru
Udupi
Manipal
Surathkal

The correct answer is A) Mangaluru.

Mangaluru is a city in the Indian state of Karnataka. It is the headquarters of the Dakshina Kannada district and is located on the Arabian Sea coast. The city has a population of over 500,000 people and is a major commercial and industrial center. Mangaluru is also a popular tourist destination, known for its beaches, temples, and churches.

Udupi is a town in the Indian state of Karnataka. It is the headquarters of the Udupi district and is located on the Arabian Sea coast. The town has a population of over 100,000 people and is a major religious and educational center. Udupi is also a popular tourist destination, known for its temples, beaches, and seafood.

Manipal is a town in the Indian state of Karnataka. It is located in the Udupi district and is known for its medical college, Manipal University, and the Manipal Group of Institutions. The town has a population of over 50,000 people and is a major educational center.

Surathkal is a town in the Indian state of Karnataka. It is located in the Dakshina Kannada district and is known for its beach, Surathkal Beach. The town has a population of over 20,000 people and is a popular tourist destination.