Final answer:
Reserve officers can typically only take their service weapon home with written approval from a higher-ranking official or according to agency policies.
Step-by-step explanation:
The policies surrounding when reserve officers can take their service weapon home can vary depending on the law enforcement agency they are a part of. However, generally speaking, the most common condition under which reserve officers might be allowed to take home a service weapon is D) Only with written approval. This approval would typically come from a higher-ranking official or administrator within the agency and is often regulated by departmental policies. Reserve officers would rarely, if ever, be allowed to take service weapons home without explicit permission, as doing so would potentially raise issues of liability and public safety.