Answer: C
Explanation: While the scientific data gathered could very well be valid, the nature of the experiment makes it sort of morally gray to benefit from the data, because the people they used were forcefully experimented on.
There are a lot of instances in science like this: questions that scienctists do have, but there's really no way to find the answer without physically or psychologically damaging humans or animals. Most of these experiments would never be performed today.