A Survey of Parents in the United States Revealed That

A survey of parents in the United States revealed that the parents were most concerned about childhood obesity and how it affected their children, not violence, drugs, or alcohol. A telephone survey was used to gather this information because:

A) face-to-face interviews allow surveyors to use nonverbal communication cues.
B) this method is not hampered by interview bias.
C) it has a low response rate and only those who really care about the issue(s) being surveyed respond.
D) it is a quick way to conduct a survey.
E) of all of the above reasons.