In a Study of Teenagers,Maruyama and Colleagues Concluded That Self-Esteem

In a study of teenagers,Maruyama and colleagues concluded that self-esteem and achievement are positively correlated because

A) higher self-esteem boosts achievement.
B) achievement produces higher self-esteem.
C) both self-esteem and achievement are linked to underlying intelligence and family social status.
D) both self-esteem and achievement are linked to healthy physical and psychological adjustment.