Final answer:
Humor plays an important role in group dynamics, although it may not always be positive. It can be used to define who is an outsider to a group and is often utilized for relaxation purposes. Different individuals may find humor in different things.
Step-by-step explanation:
Humor plays an important role in group dynamics. Observations have shown that humor is not always a positive element in groups (a) as it can also be used to define who is an outsider to a group (c). The Relaxation Theory (b) is one common use of humor in groups. However, studies in group dynamics have shown that all members do not necessarily find humor in the same things (d). Humor can vary based on cultural differences and individual preferences.