This Picture Shows Erik Erikson and His Wife Joan

This picture shows Erik Erikson and his wife Joan. Erikson isbest known for:

A) proposing an influential theory of development that has eight stages over the lifespan, with each stage having a psychosocial conflict that has to be resolved.
B) proposing a theory of moral development with three distinct levels, each level having two stages that represent different degrees of moral reasoning.
C) proposing the notion of the zone of proximal development,
which refers to the gap between what children can accomplish on their own and what they can accomplish with the help of others who are more competent.
D) proposing that children progress through four distinct cognitive stages of development, and each stage marks a shift in how they think and understand the world.