All of the Following Are Phases of a Clinical Trial

Multiple Choice

All of the following are phases of a clinical trial EXCEPT:

A) patients are given the drug or a placebo.
B) dosage level is determined and proof the drug works. From text: "Phase II focuses on finding the right dosage levels and proving the drug works" OK as is.
Author: is this phrase OK for sense?
C) testing on human subjects to determine safety.
D) determination of the cost of the medication.
E) survey of general interaction once it is in general use.