Who among the following presidents of India gave assent to the 100th Amendment of the Constitution of India?

The correct answer is Pranab Mukherjee.

Let us understand this step by step.

Step 1: What is the 100th Constitutional Amendment of India?

The 100th Amendment to the Constitution of India is a landmark amendment related to the Land Boundary Agreement (LBA) between India and Bangladesh. It enabled the exchange of certain territories (enclaves) between the two countries. This amendment gave constitutional backing to the agreement signed between India and Bangladesh to resolve a long-standing boundary dispute that dated back to the partition of 1947.

Step 2: When was the 100th Amendment passed?

The Constitution (100th Amendment) Act, 2015 was passed by both Houses of Parliament of India:
- The Lok Sabha passed it on 6 May 2015.
- The Rajya Sabha passed it on 7 May 2015.
- It received Presidential assent and was officially notified on 28 May 2015.

Step 3: Who was the President of India in May 2015?

Pranab Mukherjee was serving as the 13th President of India at that time. He assumed office on 25 July 2012 and served until 25 July 2017. Since the Presidential assent was granted on 28 May 2015, it was clearly within his presidential tenure.

Step 4: Eliminating the other options

- Ram Nath Kovind became the 14th President of India on 25 July 2017 — well after the 100th Amendment was passed.
- APJ Abdul Kalam served as the 11th President from 2002 to 2007 — before this amendment was enacted.
- Pratibha Devisingh Patil served as the 12th President from 2007 to 2012 — also before this amendment.

Conclusion:

Since Pranab Mukherjee was the sitting President of India when the Constitution (100th Amendment) Act, 2015 was enacted and notified, he was the one who gave the Presidential assent to it. Therefore, the correct answer is Pranab Mukherjee.