Why can agricultural stress occur even when total monsoon rainfall is normal?

Correct answer: If timing and distribution of rainfall do not match crop needs

Total seasonal rainfall is only one measure of whether farming conditions are favourable. Crops need water at particular stages, such as sowing, early growth, flowering, and grain or fruit formation. If a large amount of rain falls too early, too late, or in a short damaging burst, the total may still look normal while crops suffer from dry spells, waterlogging, erosion, or poor sowing conditions. Distribution through time and space therefore matters.

Option A is correct because rainfall must match crop needs in timing and distribution. Option B describes a pattern that may be helpful if the amount is suitable, so it does not explain stress by itself. Adequate soil moisture and rain at the right time generally reduce stress, making C and D inconsistent with the question. Normal total rainfall does not guarantee useful rainfall for crops.