Many students dislike working on group projects for class because they know some members of the group will not contribute much to the group, knowing that other members will pick up their slack. This is called

social loafing    

Explanation:

Social loafing: In psychology, the term "social loafing" is defined as a process in which an individual generally exert very fewer efforts while doing a particular task if he or she is being surrounded with other people as well as when he or she is a specific group as a member of that group rather when he or she is working alone. The idea behind working in a specific group is to enhance an individual's skills or to get improved accomplishment related to a specific task by enriching the talents and skills of the different members of the group.

In the question above, the given statement is called social loafing.

world bank is the correct answer.

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