Answer:
a) vapor lock
Explanation:
The Situation is called vapor lock.
vapor lock occurs when the vehicle is in traffic or high altitude or in summers when the temperatures are elevated. Vapor lock is a situation created by liquid fuel, which changes to gas while still in the gasoline-fueled internal combustion engine fuel supply system. This interferes the fuel pump's process, causing the carburetor or fuel injection system to end up losing feed pressure, culminating in a temporary power loss or a total stall. It can be tricky to restart the engine from this state.