An Assumption Underlying Maslow's Theory Is That

An assumption underlying Maslow's theory is that:

A) needs that are not yet satisfied will motivate or influence a person's behavior.
B) people move around on the hierarchy ladder to meet several needs at a time.
C) the order in which one progresses through the need fulfillment stages can be different for different people.
D) someone who fails to reach a higher need level will sometimes become frustrated and regress to a lower need level.