Correct Answer: 210

Solution : The correct option is 210.

Cotton is a warm-season crop that requires many frost-free days to grow successfully. Generally, cotton needs a frost-free period of about 210 days. The exact number of frost-free days can vary depending on the cotton variety, local climate conditions, and the specific requirements of the region where it is cultivated. Cotton is sensitive to frost, and exposure to freezing temperatures, can damage or kill the plants.