What question could you ask that would you evaluate the safety and healthfulness of this product

Hello. This question is incomplete. The complete question is:

"What question could you ask that would help you evaluate the safety and healthfulness of this product?

A. How soon can they ship it and how much does it cost? B. Where can I learn to kickbox like a person in the ad? C. How much weight can I lose if I use it for two months? D. Where was the research published and who authorized it?"

D. Where was the research published and who authorized it?

Explanation:

To assess the safety and healthfulness of a product you need to start the assessment from the beginning of the product formulation to know if all the standards needed to launch a quality product have been followed, and it is important to know who authorized the launch of the product, ie whether the person an expert in the production of this type of product, or is just an amateur.

Thus, to make this assessment you can ask the following question: "Where was the research published and who authorized it?"

the answer should be true