The correct answer is C. Call 911.
Here's why:
1. Calling 911 is the first step because Sanjay is unconscious after hitting his head, which could indicate a serious injury like a concussion or brain trauma. Professional medical help is needed immediately in this situation.
2. Removing Sanjay's helmet to check for bleeding or bandaging his head should not be done without proper medical training as it could worsen any potential injuries.
3. Moving Sanjay off the sidewalk should only be done if there is an immediate danger, but since his mother is already present, the priority is to get professional medical assistance by calling 911.
4. Performing CPR is not recommended in this scenario unless Sanjay stops breathing and there is no pulse.
