The Table Below Summarizes Results from an Experiment in Which

Multiple Choice

The table below summarizes results from an experiment in which subjects were classified as diabetic or nondiabetic and then given a treatment. After the treatment, they were again classified as diabetic or
Nondiabetic. Which combinations of before treatment/after treatment categories will yield discordant pairs?

A) Only nondiabetic/nondiabetic
B) diabetic/nondiabetic and nondiabetic/diabetic
C) nondiabetic/nondiabetic and diabetic/diabetic
D) Only diabetic/nondiabetic