Which of the Following Is True of Communication as a Method

Which of the following is true of communication as a method to resolve a social dilemma?

A) In the laboratory as in real life,group communication very rarely degenerates into threats and name-calling.
B) In the laboratory as in real life,group communication enables people to commit themselves to competition.
C) Discussing the dilemma hinders a group identity,which diminishes concern for everyone's welfare.
D) Discussing the dilemma devises group norms and expectations and pressures members to follow them.