Step 1: Understanding Rabi crops.
Rabi crops are the crops that are sown in the winter season and harvested in the summer season. The sowing season begins after the monsoon ends.
Step 2: Sowing period.
- Rabi crops are sown during October to December.
- They are harvested in April to June.
Step 3: Examples of Rabi crops.
- Wheat, barley, gram, peas, and mustard are major Rabi crops in India.
Step 4: Elimination of incorrect options.
- (A) June–July → Time for Kharif sowing, not Rabi.
- (C) January–February → Crops are already growing, not sown.
- (D) April–May → Harvesting time, not sowing.
\[
\boxed{\text{Rabi crops are sown in October–December.}}
\]