Richard, the Patient with OCD Described in the Textbook, Was

Richard, the patient with OCD described in the textbook, was compelled to take very small steps as he walked and to look back repeatedly. As with other types of checking compulsions, Richard was trying to

A) restore a sense of safety and control.
B) reduce the possibility of contamination.
C) ward off an imagined disaster.
D) make sure he didn't make a mistake.