Two researchers conduct a survey to estimate a population's take on various issues. Each question provides a statement presenting a position on the issue, and the respondent must answer among the following choices:

A. Very strongly agree

B. Strongly agree

C. Somewhat agree

D. Somewhat disagree

E. Strongly disagree

F. Very Strongly disagree

a) The answer scale used presents a major issue in terms of measurement. What is this issue? Briefly describe the problem (max 3 lines).