In the Ahmedabad session of the Indian National Congress in 1920, the proposal to adopt Complete Independence as the goal of the Congress was put forth by Hasrat Mohani, making Option 2 the correct answer.

Let`s discuss each option in brief:

1. Abul Kalam Azad: He was a prominent leader in the Indian independence movement and later became the first Education Minister of independent India. However, he is not credited with proposing Complete Independence as the goal in the 1920 Ahmedabad session.

2. Hasrat Mohani: He was a freedom fighter, noted Urdu poet, and a journalist. He was the one who moved the resolution for Complete Independence in the Congress`s 1920 session.

3. Jawaharlal Nehru: He did indeed become a strong proponent of complete Independence later, but at the 1920 congress session, it was Hasrat Mohani who made the proposal.

4. Mohandas Karamchand Gandhi: He became Congress`s pivotal leader and the face of resistance against British rule, but he didn`t originally propose the Complete Independence goal at this particular session.

Thus, Option 2 is the correct answer.