To enhance the likelihood that group members in a treatment group adhere to group guidelines, it is important to:​

A) ​brainstorm possible guidelines with group members.
B) ​discuss group guidelines only superficially.
C) ​threaten the members with the fear of expulsion if they violate the guidelines.
D) ​communicate that all the guidelines are nonnegotiable.

To enhance adherence to group guidelines, involving group members in the brainstorming and development of the guidelines can increase their sense of ownership and commitment to following them. This approach can also promote a more collaborative and open atmosphere in the group. Superficial discussions or the use of threats may result in resistance or defiance towards the guidelines, while presenting them as non-negotiable may also limit flexibility and adaptability to the changing needs of the group.