Cheryl Is Doing a Longitudinal Study of Growth of Salmon

Cheryl is doing a longitudinal study of growth of salmon at two different temperatures. In month nine, the fish in the warmer tank get sick. What should she do?

A) Continue the study for the planned year.
B) Stop the research at the point where the fish got sick.
C) Treat the fish and continue the study for the full year.
D) Throw out the data.