A Clinical Psychologist in California Is Discussing the Personality Test

A clinical psychologist in California is discussing the personality test scores of a group of clients with a colleague in Florida. She tells her colleague that her clients are scoring relatively high on this particular test. This type of comparison can be made because of the existence of:

A) Modern internet connections
B) Group norms for the test
C) Multivariate statistical techniques
D) Social mores
E) c & d