Antoinette is a real risk taker. She loves to skydive, and she can party all night. Benita dislikes risk taking and prefers quieter activities, such as reading and yoga. These contrasting preferences in the rate of physiological activation they experience suggest that Antoinette and Benita differ in their

optimal level of arousal

Explanation: arousal theory stated that individuals has different levels (grades) or arousal. Mostly when our arousal level is high, we usually do that thing that will help bring it down.optimal arousal refers to the maximum level of arousal or energy that which mental boost or encouragement of physical activities, learning and others. It is the high energy or readiness to do a particular thing. Arousal can be like to agitation,stress, motivation, drive and attention. Mostly drive or arousal among human differ what really works for you, motivate you or even have all your attention may be different from mine or higher level of your arousal is different from mine which may be of lower level of arousal.

Arousal is simply what's makes us acts,think or even do things in any way we deem fit.