To fill in the blank correctly, let's consider the context and options provided. The question asks about 'Boro', 'Aman', and 'Aus'. These terms are related to a particular context within agriculture. Let's examine the given options:
'Boro', 'Aman', and 'Aus' are known to be associated with types of rice crops that are grown in different seasons and regions in India. Specifically:
These names do not correspond to types of tribes, folk dance, or cotton crops. Hence, based on this analysis, the correct option is: Names of rice crops
Boro, Aman, and Aus are varieties of rice crops grown in different parts of India, particularly in the northeastern region:
These are all types of rice crops commonly cultivated in India.
Thus, the correct answer is (C) Names of rice crops.