The correct answer is b) Palakkad.
Palakkad is known as the “Rice Bowl of Kerala” because it is the largest producer of rice in the state. The district is also known for its fertile land, which is ideal for growing rice. Palakkad is also home to a number of rice mills, which process the rice grown in the district.
Wayanad is a district in the northern part of Kerala. It is known for its hills, forests, and wildlife. Wayanad is not a major producer of rice.
Alappuzha is a district in the southern part of Kerala. It is known for its backwaters, canals, and rice fields. Alappuzha is not a major producer of rice.
Thrissur is a district in the central part of Kerala. It is known for its temples, churches, and mosques. Thrissur is not a major producer of rice.