Congratulations! Your answer was correct.
It's A. Benzodiazepines.

Explanation: Although many clinicians employ benzodiazepines for acute stress disorder and PTSD, with increased use from 2003 to 2010, some, including the Department of Veterans Affairs and Department of Defense (2010), caution against using them for PTSD due to theoretical risks of interference with extinction learning, based on animal and very limited human research. Benzodiazepines might increase PTSD development with early use or interfere with extinction-based psychotherapies.

Muskin PR and Dickerman AL, eds. Study Guide to Psychiatry: A Companion to the American Psychiatric Publishing Textbook of Psychiatry, Sixth Edition. Arlington, VA: American Psychiatric Association Publishing; 2015: 52, 269. Click here to purchase. Members can purchase at a discount.