The capital city of Kerala is Thiruvananthapuram. It is the southernmost state in India and is known for its beautiful beaches, backwaters, and wildlife sanctuaries. Thiruvananthapuram is also home to many historical and cultural sites, including the Padmanabhaswamy Temple, the Kuthiramalika Palace, and the Napier Museum.
Kochi is the second largest city in Kerala and is a major port city. It is known for its historic Chinese fishing nets, its Jewish quarter, and its many museums and art galleries.
Kozhikode is the third largest city in Kerala and is a major commercial center. It is known for its beaches, its spice markets, and its annual Kozhikode Beach Festival.
Alappuzha is a town in Kerala that is known for its backwaters. It is a popular tourist destination and is home to many houseboats and resorts.
The correct answer is d) Thiruvananthapuram.