Which is a guideline for doctors pursuing research with human subjects?

The one guideline that researchers must ensure when doing research with human subjects is to:

“make sure that the degree of risk should not be greater than the seriousness of the problem that needs to be solved “

Before a doctor can pursue to this kind of research, there is a board of approvers who will audit whether the research’s risk is less compared to the existing problem. A go signal is only given after meticulous inspection is performed.

answer; /// i believe the correct answer is (achilles tendon)(c)

the correct answer is d