Concept: The question tests on the application of counting

Solution:

4 men can be chosen out of 8 in 8C4 ways

Now these 4, say A,B,C and D can form the following pairs and play.

AB vs CD or AC vs BD or AD vs BC. So for every 4 persons that are chosen, 3 games can be played.

Total number of games = 8C4 * 3

Option C