In a study of grocery shopping behavior, one of the questions on the instrument asked, "To what extent are you comfortable with and willing to use self-serve checkout lines at grocery stores?" This question should be redesigned because it is .

E. double-barreled

Explanation:

DOUBLE - BARRELED

A double-barreled question also known as a compound question, is a question that comprises 2 or more issues but expects only 1 answer like the question in the example.

In research, these kind of questions are usually included in error as researchers attempt to formulate synonyms or clarify question and even though done with nobel intentions, it can render data useless because there will be no way or knowing the participant's real state of mind.

answer; the automatic system because it is a "gut reactor"  

answer; the natural law school;