Which line marks the right edge of a road?

Answer: B — Solid white line

A solid white line is used to mark the right edge of the road. This type of line indicates that drivers should remain on the side of the road designated for their direction of travel. It helps define the roadway's boundaries and provides clear guidance to drivers, indicating that crossing over into the adjacent area is discouraged unless absolutely necessary. In contrast, a dashed yellow line typically separates traffic moving in opposite directions and does not indicate the edge of the road; it allows for passing where safe. A solid yellow line also separates opposing traffic lanes but indicates that passing is prohibited. A dashed white line is used to separate lanes of traffic traveling in the same direction, allowing for lane changes when safe. Understanding these markings is crucial for safe driving and road navigation.