If while watching an exquisite sunset you stop and analyze your sensations, thoughts, and feelings, you would be performing introspection as the once did.

Structuralist.

Explanation:

The movement of structuralism was founded by the German psychologist, Wilhelm Wundt.

In Structuralism, adults mind is analyzed first in simpler forms than connected with complex forms.

Structuralists use an important tool to analyze this, i.e. introspection. With the help of this tool, observations were made. The psychologist would make reports based on the emotions, feelings, and introspection. In this an object is given to students then would be asked to make observations of it and then asked what feeling does this object evokes in them.

So, the correct answer is structuralist.