In situations where multiple vehicles approach an intersection at the same time, the rules for determining which vehicle has the right of way are generally based on the positions and directions of the vehicles involved.
The vehicle that has the right of way is typically the one that is on the right of the other vehicles. If Vehicle C is located in a position that grants it priority (for example, if it is to the right of Vehicle A and Vehicle B), then this vehicle should proceed first. This rule is designed to create predictability and order on the road, helping to prevent collisions.
It's important to be aware of specific situations, such as whether any vehicles are turning, or if any traffic signals or signs are present. In this case, however, the determination that Vehicle C goes first is likely based on the standard right-of-way rules that prioritize the vehicle on the right when there are no additional traffic devices or conditions to consider.