75 POINTSSSSSS!!!!!!!!!


Which of these is an example of a random sample?

A.
A phone plan company surveys people on the beach to see how well they are receiving service, and uses this information in future advertising.

B.
Customers buying a new cell phone are surveyed about cell phone plans.

C.
Every twentieth caller to an independent radio station receives tickets to a concert.

D.
A phone survey is conducted using twenty names randomly taken from the phone book.