What warning sign is indicated by a red circle with a black snowmobile symbol?

The correct answer is that the red circle with a black snowmobile symbol indicates that no snowmobiles are allowed in that area. This type of sign is used to clearly communicate restrictions or prohibitions to snowmobilers, ensuring that riders understand where they are not permitted to operate their vehicles. Understanding this signage is crucial for maintaining safety on the trails and respecting designated areas, which may be restricted due to environmental concerns, property rights, or safety issues. Recognizing these signs helps riders avoid potential legal issues and enhances the overall safety of snowmobiling activities.

Other options would represent different kinds of signage: a warning for dangerous terrain would typically use a yellow or triangular sign, while recommended or mandatory snowmobile trails would use different symbols or colors to indicate that those paths are safe for use.