How Did Researchers Justify the Willowbrook Hepatitis Study

How did researchers justify the Willowbrook hepatitis study?

A) they believed the ultimate goal of eliminating hepatitis at the institution justified the deliberate exposure to hepatitis
B) they believed that hepatitis was so rampant that the participants would be likely to contract it anyway
C) both of the above justifications were used
D) the researchers made no attempt to justify the study