The correct answer is: b) Southwest monsoon rainfall.
The Western Ghats are a mountain range in western India that runs parallel to the Arabian Sea coast. They act as a barrier, blocking the southwest monsoon winds from reaching the Deccan Plateau. This causes the western side of the Ghats to receive much more rainfall than the eastern side.
The northeast monsoon is a seasonal wind that blows from the northeast during the winter months. It does not bring as much rainfall as the southwest monsoon, and it does not affect the Western Ghats as much.
Winter rainfall is caused by the movement of the Intertropical Convergence Zone (ITCZ) northwards during the winter months. It is a relatively small amount of rainfall, and it does not affect the Western Ghats as much as the southwest monsoon.
In conclusion, the Western Ghats act as a barrier, blocking some of the southwest monsoon rainfall.