Devinia believes she earned an "a" in chemistry because she followed the teacher's study suggestions and worked hard all semester. it is likely that devinia has a(n) locus of control.

I believe the answer is internal
Internal locus of control refers to the people who genuinely believes that they could influenced the outcome in their life.
People with internal locus of control are much more likely to make hard efforts to fulfill their goal and increase their likelihood to achieve personal success.

The three sociological perspectives include the beginner’s mind, culture shock, and the sociological imagination