Determine the Evaluation Guideline That Applies Best in Questioning the Results

Determine the evaluation guideline that applies best in questioning the results of the described study.
-To determine the average amount of physical exercise of the members of the Eureka College faculty, a student
Randomly selected a sample of 20 faculty and asked them to check a form rating daily exercise from "(1) very
Little, (2) some, (3) moderate, (4) quite a bit, (5) extensive." The student reported that, on average, a Eureka
College faculty member exercises moderately each day.

A) Consider possible confounding variables.
B) Consider the measurement of the variable of interest.
C) Consider the method of selection of the sample.
D) Consider the source.