A researcher includes the following item in their questionnaire: "Please rate your agreement with the following statement on a scale of 1 ("Not at All") to 10 ("To Very Great Extent"). Since inflation is high and employees haven't had a raise in two years, management should increase employees' pay." What is the main problem with this item? a. It uses idiomatic language. b. It is double-barrelled. c. It is leading. d. It uses sub-ordinal measurement