Q.Andhra Pradesh is popularly known as the "____ of India" because of its very high output of one particular crop.

The nickname points to the crop that dominates the state's cropped area and food-grain output, grown mainly in its great river delta.

Option (c) is correct. Andhra Pradesh is called the "Rice Bowl of India" because rice (paddy) occupies the largest share of its cropped area and food-grain production, grown above all in the fertile, canal-irrigated Krishna–Godavari delta. Option (a) is wrong — while the state does grow cotton, it is not the "Cotton Bowl". Option (b) is wrong — sugarcane is grown but is not the defining crop. Option (d) is wrong, though the state is indeed a major chilli producer (Guntur is a big chilli-trading centre); the established nickname is specifically about rice.

Picking a crop the state also grows (cotton, chillies, sugarcane) instead of the crop the nickname actually refers to — rice.