The correct answer is A. Sachidanand Sinha.
Sachidanand Sinha was a freedom fighter and politician who played a major role in the agitation for a separate state of Bihar. He was the president of the Bihar Provincial Congress Committee from 1906 to 1911 and led the agitation in Bihar for the separate state whereby in the year 1911 new provinces Bihar and Orissa were formed.
Sinha was born in 1871 in the village of Simaria in the Saran district of Bihar. He was educated at the Presidency College in Calcutta and the University of Calcutta. He started his career as a lawyer and later became a member of the Indian National Congress.
Sinha was a staunch nationalist and was opposed to British rule in India. He was a member of the Indian National Congress and was involved in the Non-Cooperation Movement and the Civil Disobedience Movement. He was also a member of the Constituent Assembly of India.
Sinha was a great leader and a freedom fighter. He played a major role in the agitation for a separate state of Bihar. He was a staunch nationalist and was opposed to British rule in India. He was a member of the Indian National Congress and was involved in the Non-Cooperation Movement and the Civil Disobedience Movement. He was also a member of the Constituent Assembly of India.
The other options are incorrect.
Option B, Anugrah Narayan Sinha, was a freedom fighter and politician who served as the Chief Minister of Bihar from 1946 to 1957. He was not involved in the agitation for a separate state of Bihar.
Option C, J. B. Kripalani, was a freedom fighter and politician who served as the President of the Indian National Congress from 1946 to 1947. He was not involved in the agitation for a separate state of Bihar.
Option D, Birsa Munda, was a tribal leader who led the Munda Rebellion against the British in the late 19th century. He was not involved in the agitation for a separate state of Bihar.