Which of the Following Is a Difference Between Flooding and Systematic

Which of the following is a difference between flooding and systematic desensitization?

A) Flooding focuses on pairing relaxation with gradual exposure to a phobic object, whereas systematic desensitization focuses on subjecting a client to experience extreme exposure to a phobic object.
B) Flooding focuses on changing behavior rather than thoughts, feelings, or motives, whereas systematic desensitization focuses on eliminating undesirable behaviors and increasing the frequency of desirable ones.
C) Flooding involves three levels of exposure to a phobic object, whereas systematic desensitization involves daily exercises in noticing and finding things in life for which one is grateful and thankful.
D) Flooding involves heavy exposure to a feared object, whereas systematic desensitization involves gradually making a person less sensitive to the feared object.