When Conducting a Survey, Face-To-Face or Telephone Interviews Yield the Most

When conducting a survey, face-to-face or telephone interviews yield the most complete information, but are expensive and time consuming. An alternative is to mail surveys, but a major problem with mail surveys is that

A) they are usually sent to an unrepresentative sample.
B) the survey return rate is typically low.
C) people are more likely to misrepresent their views by mail.
D) people are inclined to add lengthy written comments on surveys and these are hard to quantify.