Problems Facing the Soviet Union in the 1980s Included All

Problems facing the Soviet Union in the 1980s included all of the following except

A) The inability of a core feature, centralized planning, to produce needed and desired consumer goods
B) The inability of collectivized agriculture to produce enough food to free the Soviet Union from the
Necessity of importing grain
C) The activities of over-zealous Communist Party members, more interested in Marxist purity than in practical solutions to problems
D) Lack of incentive of workers to work hard or even show up regularly