(C) Rice
Rice is a kharif crop, is the staple food crop, requires high temperature and humidity, and needs annual rainfall above 100 cm — all conditions match.
All four clues directly match the description of Rice given in the textbook. Wheat is a rabi crop; Maize doesn't require above 100 cm rainfall; Jowar is a rain-fed millet. Eliminate wrong options using cropping season and rainfall clues.