A popular beach known for its water sports and vibrant nightlife is:

Calangute
Baga
Anjuna
Palolem

The correct answer is Baga.

Baga is a popular beach in North Goa, India. It is known for its white sand, clear water, and vibrant nightlife. The beach is also a popular spot for water sports, such as jet skiing, parasailing, and banana boat rides.

Calangute is another popular beach in North Goa. It is similar to Baga in terms of its white sand and clear water, but it is less crowded and has a more relaxed atmosphere.

Anjuna is a beach in North Goa that is known for its flea market and its hippy culture. The beach is also a popular spot for parties and concerts.

Palolem is a beach in South Goa that is known for its beautiful scenery and its laid-back atmosphere. The beach is also a popular spot for swimming, sunbathing, and water sports.