Existing Evidence Suggests That Coordination to the Payoff Dominant Equilibrium

Existing evidence suggests that coordination to the payoff dominant equilibrium is easier to achieve when:

A) participant groups are randomly re-matched from one round to the next rather than when group composition remains unchanged over time.
B) participant group composition remains unchanged over time as opposed to when groups are randomly re-matched from one round to the next.
C) Groups are larger rather than smaller.
D) participants are not allowed to communicate as opposed when communication is allowed.