Step 1: Understanding Aus.
Aus is a variety of rice grown in India and Bangladesh. It is typically sown in summer (March-April) and harvested in autumn.
Step 2: Analyzing the options.
(A) Wheat: Incorrect — Aus is not a wheat variety.
(B) Rice: Correct — Aus is a type of rice crop.
(C) Maize: Incorrect.
(D) Millet: Incorrect.
Step 3: Conclusion.
Thus, Aus is a type of rice.