Among the given options, Sardar Vallabhbhai Patel, Acharya J.B. Kriplani, and K. M. Munshi were all members of the Constituent Assembly. However, Lok Nayak Jayprakash Narayan was not a member of the Constituent Assembly.
Sardar Vallabhbhai Patel, also known as the Iron Man of India, played a crucial role in the Indian independence movement and was a prominent leader of the Indian National Congress. Acharya J.B. Kriplani, a well-known socialist leader, was also a member of the Constituent Assembly. K. M. Munshi, a prominent lawyer and writer, was also a member of the Constituent Assembly.
Lok Nayak Jayprakash Narayan, on the other hand, was not a member of the Constituent Assembly. He was a social and political activist who later played a significant role in opposing the emergency imposed by then-Prime Minister Indira Gandhi in the 1970s.
Therefore, among the given options, option 3 (Lok Nayak Jayprakash Narayan) is the correct answer as he was not a member of the Constituent Assembly.