The correct answer is: A) Regent Maharani Sethu Lakshmi Bayi.
The Temple Entry Proclamation of 1936 was issued by Regent Maharani Sethu Lakshmi Bayi, the then ruler of the princely state of Travancore. The proclamation allowed all Hindus, regardless of caste, to enter temples in Travancore. This was a major step forward in the fight for social equality in India.
The other options are incorrect. Diwan Sir C.P. Ramaswami Iyer was the chief minister of Travancore at the time of the proclamation. Maharaja Chithira Thirunal was the titular head of the state, but he was a minor at the time and Maharani Sethu Lakshmi Bayi was the regent. The British Resident was the representative of the British government in Travancore.
The Temple Entry Proclamation of 1936 was a landmark event in the history of Kerala. It was a major step forward in the fight for social equality and it helped to improve the lives of millions of people in the state.