Antheia is a real risk taker. She loves to skydive, and she can party all night. Fabio enjoys some risky activities, such as mountain biking, but he prefers moderation in most things. Benita dislikes risk-taking and prefers quieter activities, such as reading and yoga. Antheia, Fabio, and Benita differ in their

a.preferred level of exercise.
b.drive to achieve.
c.need for security.
d.optimal level of arousal.