Which perspective most clearly focuses on how we learn observable responses?

The perspective that most clearly focuses on how we learn observable responses is called the behavioral perspective.

Explanation:

In psychology, the behavioral perspective focuses on observable responses, whether they are conscious or unconscious, and the process of learning them. For this perspective, every human behavior can be understood in terms of a response and a stimulus.

it is due to the halo effect as the impression of the boy created earlier.on the mind of the principle affected his decision