Two answers can be candidates here. D is definitely NOT a bivariate data because it's asking to collect info on only one variable.
The other candidate for not being a bivariate data is B because it's asking for info on their weights only. However, notice how B is about studying a group of "diabetic patients". So, if the analysis is about weights and patients' level/severity of their diabetic illness, then, it can technically be viewed as a bivariate data.
Overall, if you must choose only one here, then the answer is D.

Michael C.
06/07/22
Lily M.
Thank you so much06/05/22