______ is the most cultivated crop of Kerala.

The correct answer is Option D (Coconut). Coconut is the most cultivated crop in Kerala and occupies the largest area under cultivation among the state's crops. Kerala's warm and humid tropical climate, abundant rainfall, and coastal geography provide ideal conditions for coconut cultivation. The crop is an important source of income and employment and is widely used in food, oil production, coir manufacturing, and various traditional industries. Therefore, coconut is rightly regarded as the most cultivated crop of Kerala.