One of the major concerns of developmental psychology centers around the issue of

A) identity or intimacy.
B) continuity or stages.
C) imprinting or object permanence.
D) conservation or egocentrism.

Continuity or stages refers to the debate about whether development occurs gradually and continuously, or in distinct stages. This is a major concern in developmental psychology. The other options (identity or intimacy, imprinting or object permanence, conservation or egocentrism) are also important concepts in developmental psychology, but they are not as central to the field as the continuity vs. stages debate.