The correct answer is: B. 750 mm a year
The peninsular interior is the region of India that lies south of the Vindhya Range. It is a vast and diverse region, with a wide range of climates. The rainfall in the peninsular interior averages about 750 mm a year. This rainfall is concentrated in the monsoon season, which runs from June to September. The monsoon rains are essential for agriculture in the region.
Option A: 650 mm a year is too low. The average rainfall in the peninsular interior is 750 mm a year.
Option B: 750 mm a year is the correct answer. The average rainfall in the peninsular interior is 750 mm a year.
Option C: 850 mm a year is too high. The average rainfall in the peninsular interior is 750 mm a year.
Option D: 550 mm a year is too low. The average rainfall in the peninsular interior is 750 mm a year.