Step 1: Understanding the Question:
We have to name the person who delivered the speech in the passage. The passage itself gives us the identity clue in its first line, so we use that along with what we know about the Assembly.
Step 2: Key Approach:
First list who in the Assembly could say 'as an Adibasi'. Then remove every name that the speaker refers to as someone else or that does not fit a tribal background.
Step 3: Detailed Explanation, step A: The speech names someone.
The speaker mentions Pandit Nehru and says he trusts his word. So the speaker is a different person from Nehru. Option (1) is out.
Step 4: Detailed Explanation, step B: The speaker's background.
The speaker says he is an Adibasi and that his people were pushed off their land and treated with contempt. Among the four names, only one came from a tribal community and spoke for it. That person is Jaipal Singh. Option (3) fits.
Step 5: Detailed Explanation, step C: The other two names.
Patel and Pant were senior Congress leaders. Their Assembly work was about other matters, such as minority rights and other political questions. Neither of them would describe himself as an Adibasi. Options (2) and (4) are out.
Step 6: Cross check with the demand.
The speaker asks for reserved seats in the legislature so that tribals can speak for themselves. This was the stand taken by Jaipal Singh in the Assembly, which supports the choice.
Final Answer:
The speaker is the tribal leader Jaipal Singh. This is the third printed option.
\[ \boxed{3} \]
