Determine Whether the Study Involves Selection Bias, Participation Bias, Both

Multiple Choice

Determine whether the study involves selection bias, participation bias, both selection bias and participation bias, orneither.
-"38% of adults in the United States regularly visit a doctor". This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college.

A) Participation bias
B) Selection bias
C) No bias
D) Participation bias and selection bias