Which behavioral strategy does the PMHNP suggest next?

The patient attempts the PMHNP’s sleep hygiene recommendations for 2 weeks, but does not make any progress mitigating nightmares and hyperarousal. Which behavioral strategy does the PMHNP suggest next?
| A. | Progressive muscle relaxation exercises | |
| B. | Paradoxical interventions | |
| C. | Biofeedback | |
| D. | All of the above |