Without Random Sampling, Which of the Following Can Happen

Multiple Choice

Without random sampling, which of the following can happen?

A) Naturally occurring confounding variables can result in an apparent relationship between the explanatory and response variables.
B) The results may not be able to be extended to a larger population.
C) The researchers will have a much easier time getting participants for their study, resulting in a larger sample size, and more accurate data.
D) None of the above