Who was elected as the president of the Constituent Assembly of India in 1946?

Dr. Rajendra Prasad

The correct answer is Option (3) - Dr. Rajendra Prasad

Dr Sachidanand Sinha was the first president of the Constituent Assembly. Later, Dr Rajendra Prasad was elected its president.

Dr. Rajendra Prasad was elected as the permanent president of the Constituent Assembly on December 11, 1946. He played a vital role in guiding the assembly's deliberations and overseeing the drafting of the Indian Constitution.