Answer:
D. It’s ok to pet a service dog if he doesn’t look busy.
Step-by-step explanation:
Service dogs are trained to increase the quality of life of People with Disabilities, offer independence and the opportunity to live without the need for constant help from professionals or family members. Service dogs are easy and cute, but cannot treat the same way as other dogs.
When you find a service dog and he is using the disability tag, it means he is working, so you should not touch or pet him, let alone play with him, even if he is "unoccupied" as he may be distracted and cause an accident to its owner.