When is it permissible to park over a fire hydrant?

Answer: B — Only if someone who can move the vehicle stays with it

Parking over a fire hydrant is generally not permissible because access to the hydrant must always be maintained in case of an emergency. Option B suggests that it is acceptable to park over a fire hydrant only if someone who can move the vehicle stays with it. This indicates a form of managing the potential obstruction, as the person staying with the vehicle can quickly move it if emergency services need access to the hydrant. However, this practice can still be problematic because it may not ensure timely access for emergency responders. The most appropriate context is that parking regulations prioritize access to fire hydrants to ensure the safety of the community and effective firefighting capabilities. In reality, the safest and most responsible choice is to avoid parking in such positions altogether to prevent any potential delays during emergencies.