Which of the Following Is True of the Size of a Group

Which of the following is true of the size of a group while resolving social dilemmas?

A) In a much larger commons-say,a city-voluntary conservation is more successful than a small commons.
B) In a small commons,each person feels more responsible and effective than large groups.
C) As a group grows larger,people rarely make common excuses for noncooperation.
D) In small groups,people feel less identified with a group's success than they do in large groups.