Communication Between Group Members Facilitates Donation of Resources to a Group

Communication between group members facilitates donation of resources to a group effort to save the environment because

A) communication increases awareness of environmental problems.
B) talking among themselves produces normative pressures to conform.
C) the desired behaviour becomes clear.
D) the possibility of future greater personal gains may be mentioned.
E) participants can see no way to terminate the discussion except by donating their funds.