High temperature and low pressure over the Indian subcontinent during the summer season draws air from the Indian Ocean leading to the in-blowing of the:

Answer: (b) South-west monsoon

The low over NW India draws in moist air from the Indian Ocean as the south-west monsoon.

The idea

Winds respond to pressure differences, while Earth’s rotation changes their path. In summer, low pressure over heated Asian land draws air towards it from the ocean. Cross-equatorial flow turns right in the Northern Hemisphere and reaches India as a south-westerly wind.

Asian land heats in summer → Low-pressure belt shifts north → Air flows from the southern Indian Ocean → South-east trades cross the equator → Northern Hemisphere deflection is to the right → Moist south-westerlies approach India

Why the others are wrong

(a) South-east trades cross the equator and turn into the SW monsoon.

(c) The trade winds are the base flow, not the name of this wind.

(d) Westerlies are mid-latitude winds.

The trap

The SE trades DO become the SW monsoon after crossing the equator (Coriolis turns them).

Also know

The Mascarene High in the southern Indian Ocean helps drive the cross-equatorial flow. The fast low-level Somali jet strengthens the Arabian Sea branch. Winds are named for where they come from, so a south-westerly blows towards the north-east.