A Difference Between Maslow's Need Hierarchy and Alderfer's ERG Theory

Multiple Choice

A difference between Maslow's need hierarchy and Alderfer's ERG Theory is that

A) ERG theory states that various needs operate simultaneously.
B) Maslow's hierarchy has more scientific validity.
C) Maslow's hierarchy reminds managers that even if one need seems to motivate people,other needs may still need attention.
D) ERG theory focuses on five levels of need.
E) only Maslow's theory serves to remind managers of the types of reinforcers that can be used to motivate people.