The Use of a "No Opinion" Option in Fixed-Alternative Response

Multiple Choice

The use of a "no opinion" option in fixed-alternative response questions is

A) not necessary because individuals will always express an opinion.
B) recommended by all leading authorities on questionnaire design.
C) not recommended because it allows individuals to "take the easy way out".
D) appropriate if pretesting or exploratory research reveals that 20-25% of the respondents either don't know or don't hold an opinion.
E) not likely to affect the results of the survey.