Researchers Have Found That by Offering a "Neutral" Response on a Scale,respondents

Multiple Choice

Researchers have found that by offering a "neutral" response on a scale,respondents who lack knowledge about a question will indicate a neutral response along with the respondents who are indeed neutral.To resolve this issue,researchers :

A) suggest respondents skip the question.
B) use "somewhat" categories.
C) use comparative rating scales.
D) offer a "don't know" response.
E) change the question to a "yes-no" format.