Nursing interventions

At night an elderly client with senile dementia wanders into other clients rooms, awakening them.  What is the best nursing interventions for dealing with this clients insomnia and nocturnal roaming?

A. Administer a benzodiazepine at bedtime as ordered
B. Administer a low dose antipsychotic at bedtime as ordered
C. Administer a barbiturate at bedtime as ordered
D. Lock the clients door at bedtime