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.

A) extrinsic motivations.
B) optimal levels of arousal.
C) intrinsic motivations.
D) self-actualization.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.