Dr. Schultze conducts research on the effects of a new drug on obsessive-compulsive disorder. In his study, neither Schultze nor the participants knows who is receiving the active drug and who is receiving the placebo. This example describes

Which was the original difference between sunnis and shias? a. they disagreed on the content of the five pillars. b. they disagreed on the role of sharia in muslim society. c. they disagreed on the role of imams in the islamic religion. d. they disagreed on who should have succeeded muhammad.