Gardner and Steinberg (2005)arranged a Study in Which Adolescents and Older

Gardner and Steinberg (2005) arranged a study in which adolescents and older adults played a simulated driving game either alone or with peers.The researchers measured risky behaviour in terms of the number of crashes that occurred during the game.They found that the presence of peers:

A) greatly increased crashes for both age groups.
B) significantly decreased crashes for both age groups.
C) greatly increased crashes for adolescents but significantly decreased crashes for older adults.
D) greatly increased crashes for adolescents but had little effect for older adults.