If you adopt the perspective, you'll reject an emphasis on what goes on in people's minds in favor of focusing on measurable behaviors that can be objectively measured.

Behavioral.

Explanation:

Behavioral perspective involves the analysis of people's behavior, interaction and stimulus-response like admiration, feedback, rewards etc. Behaviorists are influenced by the idea that changes in the behavior of people as a consequence of the interaction with the environment. It neglects the dealings with the thoughts, ideas or perceptions going through the mind of the people. These all are included in the Cognitive perspectives. Thus, behavioral perspective focuses on observable events like actions, behavior, etc. and in doing so, it ignores the psychological developments which may also be the reason for any particular action.

the answer is a)   a sentence of death costs the state "almost three times as much as a sentence of life in prison" (delon 147)