Answer: Option 'C' is correct.
Explanation:
Gridlocks is a type of traffic congestion in which there is a blockage of intersecting streets by queues of vehicles in every possible direction.
Traffic results in complete stand still.
So, It occurs when vehicles get stuck in the middle of an intersection.
It traditionally occur when there is a green light and all vehicles are start moving towards the intersection and there is no enough space on the either side of road.
At that time vehicles block the intersection of streets and stuck in the middle of it.
Hence, Option 'C' is correct.
