In which of the following years did the Constitution (One Hundredth Amendment) Act come into force?

The correct answer is 2015.

Step-by-step Explanation:

1. The Constitution (One Hundredth Amendment) Act was enacted to give effect to the acquiring of certain territories by India and transfer of certain other territories to Bangladesh in pursuance of the Land Boundary Agreement (LBA) signed between India and Bangladesh.

2. The bill was passed by the Parliament of India in May 2015 and received the assent of the President of India on May 28, 2015.

3. Consequently, the Act officially came into force on July 31, 2015, when India and Bangladesh exchanged 162 enclaves.

Therefore, the Constitution (One Hundredth Amendment) Act came into force in the year 2015.