Which of the Following Is Likely to Be True of a Phase

Which of the following is likely to be true of a Phase I clinical trial?

A) A Phase I clinical trial may be a retrospective trial of 2000 patients.
B) A Phase I clinical trial is often opened to a small group of people with a number of different types of cancer.
C) A Phase I clinical trial involves many clinical centers and large numbers of patients.
D) A Phase I clinical trial is only completed when every patient is cured.