How many times President has declared National emergency in India?

Three times

The correct answer is Option 1 - Three times

The President of India has declared a National Emergency three times in India's history:

The first National Emergency was declared in 1962 during the Indo-China War.
The second National Emergency was declared in 1971 during the Indo-Pakistani War.
The third National Emergency was declared in 1975, also known as the "Emergency" or "Internal Emergency," which lasted until 1977.