Select the Sample Most Representative of the Population of Interest

Select the sample most representative of the population of interest
-A concerned parent wants to determine the amount of time spent on the phone by her child's friends.

A) The results of a national poll of 1800 students in the same age group as the child
B) The answers to the question by the parent(s) of 10 of the friends
C) The answers to the question by 10 of the friends
D) The phone records of 10 of the group of friends