The correct answer is c) Kasaragod.
Clam fishing is a traditional livelihood activity in Kasaragod district of Kerala, India. The district is home to a number of rivers and backwaters, which provide a suitable habitat for clams. Clams are harvested by hand or using simple tools, and are then sold fresh or dried. Clam fishing is an important source of income for many people in Kasaragod district.
Option a) Alappuzha is a district in Kerala that is known for its backwaters and houseboats. However, clam fishing is not a traditional livelihood activity in Alappuzha.
Option b) Wayanad is a district in Kerala that is known for its hills and forests. Clam fishing is not a traditional livelihood activity in Wayanad.
Option d) Kollam is a district in Kerala that is known for its beaches and seafood. Clam fishing is not a traditional livelihood activity in Kollam.