1. The problem asks to identify which option is NOT a bivariate data pair. 2. A bivariate data pair consists of two related variables measured together. 3. Let's analyze each option: - a. hours studied and test scores: two variables, so bivariate. - b. age and height: two variables, so bivariate. - c. favorite food only: only one variable, so NOT bivariate. - d. number of pets: only one variable, so NOT bivariate. 4. Since the question asks for which is NOT a bivariate data pair, options c and d are not bivariate. 5. Among the options, c. favorite food only is clearly a single variable, so it is NOT a bivariate data pair. Final answer: c. favorite food only