Option 1 -> Cotton is a Kharif crop, grown during the monsoon season (June-October).
Option 2 -> Watermelon is a Zaid crop, cultivated during the summer season (March-June).
Option 3 -> Mustard is a Rabi crop, grown during the winter season (October-March).
Option 4 -> Groundnut is primarily a Kharif crop, sown during the monsoon season.
Hence, Option 2: Watermelon -> Zaid season is the short summer cropping season between Rabi and Kharif (March-June), characterized by crops that can withstand high temperatures. Watermelon, along with other crops like cucumber, muskmelon, and bitter gourd, thrives in this hot, dry period -> correct