Those arguing for the inclusion of a neutral option on an interval scale believe that some respondents do not have opinions formed on that item, and they must be given the opportunity to indicate their ambivalence.

True.

Explanation:

An argument may be defined as the series of the statements that are known as premises. The individual can be involved in the argument to prove the strength of the true statement.

The interval scale is also involved in the arguing. Some arguers or responders might do not have same thinking on the same items. Each individual must given a chance to prove their thinking or feelings.

Thus, the answer is true.