What Was Socialist Realism of the Soviet Era in the Russian

What was socialist realism of the Soviet era in the Russian Domain?

A) a type of theater that is similar to today's "reality TV"
B) a writing style in the Soviet domain
C) a musical style that emphasized traditional melodies, combined with classical instrumentation
D) an artistic style devoted to the realistic depiction of workers challenging nature or struggling against capitalism
E) a holistic approach to the arts in the former Soviet Union