The correct answer is b) Southwest Monsoon.
The Virippu season is a time of heavy rains and flooding in Kerala, India. It coincides with the Southwest Monsoon, which is a seasonal wind that blows from the southwest towards the northeast. The Southwest Monsoon brings heavy rains to Kerala from June to September.
The other options are incorrect because they do not coincide with the Virippu season. The Northeast Monsoon blows from the northeast towards the southwest and brings rains to Kerala from October to December. The winter months are from December to February and are a time of dry weather in Kerala. The summer months are from March to May and are a time of hot and humid weather in Kerala.
The Virippu season is a time of great natural beauty in Kerala. The rains bring lush greenery to the state and the waterfalls are in full flow. However, it is also a time of danger, as the heavy rains can cause landslides and flooding.