When Constructing a Hierarchy for Desensitization, Situations Should Be Ordered

When constructing a hierarchy for desensitization, situations should be ordered

A) so that mildly disturbing and very disturbing situations are balanced and intermixed.
B) from the least disturbing to the most disturbing.
C) differently each time the hierarchy is reviewed.
D) so that the first five situations cause no noticeable increase in muscular tension.