Answer:
B. Physical control, coercion, undue influence, and manipulation
Step-by-step explanation:
The four common abuses -- physical control, coercion, undue influence and manipulation -- in human research that give rise to vulnerability and which make the vulnerable people not to make informed decision. Once persons like children, prisoners and person with disabilities are physically controlled, they are coerced to come under influence or put in such situations that they are manipulated.
The physical control and coercion are the most severe while undue influence and manipulation the the least severe.