When did India conduct a series of nuclear test for demonstrating its capacity to use the nuclear energy for military purpose?

May 1998

The correct answer is Option 3 - May 1998

India conducted a series of nuclear tests in May 1998, demonstrating its capacity to use nuclear energy for military purposes. Pakistan soon followed, thereby increasing the vulnerability of the region to a nuclear exchange. The international community was extremely critical of the nuclear tests in the subcontinent and sanctions were imposed on both India and Pakistan, which were subsequently waived. India’s nuclear doctrine of credible minimum nuclear deterrence professes “no first use” and reiterates India’s commitment to global, verifiable and non-discriminatory nuclear disarmament leading to a nuclear weapons-free world.