Hi, the answer that makes the most sense would be A). Drug Tests do not "Catch" many people. Answer choice B & C can be easily eliminated and that leaves A & D. With D not actually being a known fact I would go with A. Hope this was correct & helped you :)
Answer:
To learn more.
Explanation:
Scientists want to know the advantages and downsides of it, like any other invention. To see if it can replace something else and be safer.
Water and meat my amigo friend