Step 1: Understanding the Concept:
The passage is a speech made in the Constituent Assembly while welcoming the Objectives Resolution. The speaker calls himself an Adibasi and speaks for tribal people. So we must find which leader of the Assembly was a tribal representative.
Step 2: Pick up the clues in the speech.
The speaker says he is an Adibasi, so he belongs to a tribal community. He talks about the long neglect of his own people and asks for a new chapter of equal opportunity. He also pleads for seats reserved for tribals in the legislature.
Step 3: Check option (1), Jawaharlal Nehru.
Nehru moved the Objectives Resolution. The speaker actually addresses him by name and says he takes him at his word. A speaker cannot be talking about himself in the third person, and Nehru was not a tribal leader. So (1) is wrong.
Step 4: Check option (2), Vallabhbhai Patel.
Patel headed the committee on minorities and fundamental rights. He was not an Adibasi and did not describe himself as one. So (2) is wrong.
Step 5: Check option (3), Jaipal Singh.
Jaipal Singh Munda came from a tribal community of Jharkhand. He was the well known tribal voice in the Constituent Assembly and he pressed for protection of tribals. The words and the demand in the passage match him. So (3) is right.
Step 6: Check option (4), Govind Ballabh Pant.
Pant was a leader from the United Provinces. He spoke on other issues, and he was not an Adibasi. So (4) is wrong.
Final Answer:
The speaker describes himself as an Adibasi and speaks for tribal people, which fits Jaipal Singh. This is option (3).
\[ \boxed{3} \]
