What Is the Primary Difficulty with Applying the Criterion of "Unconventionality

What is the primary difficulty with applying the criterion of "unconventionality" to define abnormal behavior?

A) Norms are difficult to enumerate.
B) Cultures accept and view all behaviors as normal.
C) Behavior that is considered disordered in one context may be acceptable in another.
D) Norms do not guide behavior except in rare instances.
E) All norms are relative so there is no such thing as abnormality.