Final answer:
At an uncontrolled intersection, the vehicle on the right has the right of way, and the vehicle on the left should yield to it.
Step-by-step explanation:
When two vehicles reach an uncontrolled intersection at the same time, the rule of the road is that the vehicle on the right has the right of way. This means that the correct answer is (c) The vehicle on the right. The vehicle on the left should yield and wait for the vehicle on the right to proceed. This rule helps prevent accidents and ensures a smooth flow of traffic when traffic signals or signs do not govern the intersection. It's a practical guideline ingrained in driving conventions, ensuring safety and fluidity at these unmarked junctions, effectively guiding drivers through shared spaces, and averting gridlock through a clear protocol for yielding and proceeding.