Researchers Examined the Relationship Between Interpersonal Violence and Health in College

Researchers examined the relationship between interpersonal violence and health in college age women. 540 students were selected to participate in the study, however, 93 did not answer the questions about violence and were thus not included in the study. Not answering the violence questions is an example of

A) Exclusion criteria
B) Follow up error
C) Quota sampling
D) Sampling bias