What color line indicates the right side of the road?

The correct choice indicates that a white line is used to mark the right side of the road. In road marking conventions, white lines are standard for indicating the edge of lanes and to delineate safe areas for vehicles. They are typically found along the right edges of roadways to guide drivers and help them stay within their designated driving space.

A yellow line, on the other hand, is generally used to separate lanes of traffic moving in opposite directions, signaling caution and indicating where overtaking may or may not be allowed. Red lines can signify various restrictions or prohibitions but are typically not standard in roadside markings. Blue lines are often utilized to mark spaces designated for special vehicles, like those carrying persons with disabilities, rather than to indicate the road edge. Thus, understanding these color conventions is crucial for safe navigation on the roads.