What Was the Significance of the Kronstadt Mutiny

What was the significance of the Kronstadt Mutiny?

A) It suggested that the Russian Orthodox Church retained considerable power.
B) It indicated that ethnic rivalries within USSR would be problematic.
C) It proved that Soviet workers were incapable of organizing effective resistance.
D) It represented the end of Soviet promises of equality for women.
E) It made it clear that Bolsheviks' main concern was preserving their own power.