Regarding Desensitization, Which of the Following Statements Is FALSE

Regarding desensitization, which of the following statements is FALSE?

A) For most phobias, desensitization works best when people are directly exposed to the stimuli and situations they fear.
B) For a simple phobia, like spider phobia, the procedure can be successfully done in groups.
C) The effectiveness of desensitization is caused not by the actual process of therapy but by a client's expectations that the therapy will help.
D) Desensitization can be completed in one session for some fears, such as riding in an elevator.