If People in the Experimental Group Get Some Drug That

Multiple Choice

If people in the experimental group get some drug that might improve memory,what do people in the control group do?​

A) They get some ineffective chemical instead of the drug.
B) ​They get to decide whether or not to take the drug.
C) ​They observe the people in the experimental group.
D) ​They wait until they find out how effective the drug was.