D) Rubber — Rubber is a plantation crop grown on large areas as a commercial crop. Other plantation crops include tea, coffee, sugarcane, and banana.
Source: Agriculture, Types of Farming (Commercial Farming/Plantation)
The passage clearly states: "In India, tea, coffee, rubber, sugarcane, banana, etc., are important plantation crops." Wheat, Bajra, and Rice are food/cereal crops, not plantation crops. Examiners expect you to recall the list of plantation crops directly from the textbook.