The ruler of Travancore known for his administrative reforms and modernization efforts was:

Visakham Thirunal
Dharma Raja
Ayilyam Thirunal
Moolam Thirunal

The correct answer is: A) Visakham Thirunal

Visakham Thirunal Rama Varma (1829-1888) was the Maharaja of Travancore from 1868 to 1888. He is known for his administrative reforms and modernization efforts. He introduced a number of reforms, including the establishment of a public education system, the construction of roads and railways, and the introduction of Western-style dress and customs. He also promoted the development of agriculture and industry.

Dharma Raja (1758-1816) was the Maharaja of Travancore from 1798 to 1816. He is known for his military reforms and his efforts to modernize the Travancore army. He also built a number of temples and palaces.

Ayilyam Thirunal (1817-1860) was the Maharaja of Travancore from 1846 to 1860. He is known for his religious reforms and his efforts to promote education. He also built a number of temples and palaces.

Moolam Thirunal (1792-1846) was the Maharaja of Travancore from 1813 to 1846. He is known for his administrative reforms and his efforts to promote education. He also built a number of temples and palaces.