Each of the following sentences is followed by four words or group of words. Fill in the blanks with the appropriate word or group of words.

Nowadays there exists a spirit of___ among the various departments of the University. This has led to a number of interdisciplinary research publications due to interaction of various research groups.

A. co-operation

B. education

C. casteism

D. favouritism

Please do not use chat terms. Example: avoid using "grt" instead of "great".