In-home interviews are:

a. inexpensive and fast.
b. likely to reduce respondents' willingness to participate.
c. structured question/answer exchanges that are conducted in the comfort of the selected subject's home.
d. often about a highly technical subject.
e. conducted through the postal service using a respondent's home address.

Answer: c. structured question/answer exchanges that are conducted in the comfort of the selected subject's home.