Alex,a University Student,wants to Know How Many of Her Dorm

Alex,a university student,wants to know how many of her dorm mates have tried marijuana,so she decides to survey everyone on her floor.Despite rumours to the contrary,the results suggest that fewer than ten percent of her classmates have tried the drug.What is the most likely explanation for her findings?

A) People being interviewed often change their answers to increase the chances that they will be viewed favourably.
B) Her dorm mates did not understand the question.
C) Alex did not calculate the findings correctly.
D) Surveys are not an acceptable means to gather new information.