Option 1: October - November

The Kharif crops are harvested during the period of October - November. Kharif crops are typically sown at the onset of the monsoon season and are harvested at the end of the rainy season. These crops include rice, maize, soybeans, cotton, and sugarcane, among others.

Option 2: May - June

This option is incorrect as May - June is not the correct timeframe for harvesting Kharif crops. This period falls during the summer season, which is not conducive for the growth and harvesting of Kharif crops.

Option 3: March - April

This option is incorrect as March - April is also not the appropriate time to harvest Kharif crops. It falls during the spring season, whereas Kharif crops rely on the monsoon rains for their growth.

Option 4: June - July

This option is incorrect as June - July is the period when Kharif crops are typically sown, not harvested. Harvesting usually takes place later, in October - November, as mentioned in the correct answer.

Therefore, the correct answer is option 1: October - November.