A researcher conducted a study to learn about the association between food insecurity and anxiety. She wanted to generalize the study to all college students, however, her participants ended up mostly being students in public health. This would cause a problem with:

A. Random Error

B. External Validity

C. Internal Validity

Solve the question with the correct answer and a well-detailed proper explanation so that I can understand the concept, please...!

It is important for me, please...!