When a crowd of people clap or cheer, it is difficult to tell just how loud each individual is applauding or cheering. If people tend to clap louder when they are alone than when they are in a crowd, they are probably engaging in:.
a. social facilitation.
b. social loafing.
c. cognitive dissonance.
d. groupthink.

Social loafing

Explanation:

Social loafing describes a phenomenon whereby an individual does not put in much effort to achieve a particular goal when they are part of a group.

People who exhibit this type of behaviour put in much more effort when carrying out individual activities, being part of a group makes them less productive.

When certain individuals in a group are seen as inactive members, there tends to be a split of of the group due to the fact that some are contributing while others are not contributing anything to the success and growth of the group.