What rule applies at unmarked intersections?

Answer: B — The right-before-left rule

At unmarked intersections, the right-before-left rule applies. This means that when two vehicles reach an intersection at the same time, the driver on the right has the right of way. This rule is essential for ensuring that traffic flows smoothly and safely at intersections where there are no signs or signals to direct the drivers. Understanding the right-before-left rule is crucial for reducing the likelihood of accidents at these intersections, as it provides a clear guideline for drivers about how to proceed when they encounter vehicles from different directions. This rule emphasizes the importance of being aware of other drivers and practicing caution, as it helps establish priority in situations where the right of way is not clearly defined by traffic control devices.