Identify Which of the Following Is an Example of Random

Identify which of the following is an example of random sampling method.

A) A journalist approaches a table at a political event and asks everyone at the table their opinion of the host organization.
B) A focus group,made up of volunteers,is asked what they think of three videos promoting water conservation.
C) A health insurer uses a computer-generated random list of plan members to conduct a quality-control review.
D) An administrative assistant sends a survey about her company's new product to everyone on a subscriber's mailing list.