How close can you park to a fire hydrant?

Answer: C — 5 feet

Parking too close to a fire hydrant can hinder the ability of firefighters to access the hydrant in case of an emergency. Option A, 20 feet, is too far as it could potentially block a lane of traffic. Option B, 10 feet, is also too far as it may not leave enough space for a fire truck to maneuver around the parked vehicle. Option D, 15 feet, is also incorrect as it is closer than the recommended distance. Therefore, the most suitable option is C, which provides enough space for emergency vehicles to access the hydrant while also not taking up additional space that could impede traffic flow. It is important to always follow parking laws and regulations to ensure the safety and accessibility for emergency services.