A social studies teacher wants to know which news magazine, Time or Newsweek, is the most read by the parents of students in his school. Which sample is most likely to evidence personal bias?

A)

A group of 30 students reporting on magazines delivered to their homes

B)

None of the samples is likely to bias the results by personal interest.

C)

A group of 30 students reporting on magazines they see their parent read

D)

A group of 30 parents to be contacted by phone