A police department commissioned a door-to-door survey of citizens on whether they commit minor law infractions, such as speeding or illegal parking. The interviewers told the interviewees that they would not be investigated or ticketed for any minor infractions they may have committed. An analysis suggested that there was bias in their responses. This would likely be an example of a (an): a) Placebo effect
b) Interviewer-induced bias
c) Under-coverage bias
d) Voluntary response bias
e) Double-blind effect