Who was the leader that introduced communism and cental planning to the former Soviet Union?

a. karl marx

b. joseph stalin

c. vladimir lenin

d. friedrich engles

It was Lenin.

It cannot be Stalin, because Lenin is his predecessor and it is with Lenin that the central planning and communism was introduced to what was then Russia.

Karl Marx and Engels created together communism, but didn't introduce it specifically to Russia. They wrote their ideas and they spread all around the world and Lenin was inspired by them.