When two cars enter an open intersection at about the same time,
the driver who signals first has the right-of-way.
the driver on the right must yield to the car on the left.
the driver on the left must yield to the car on the right.
both cars can move at the same time.

the driver on the left must yield to the car on the right.

Explanation:

The driver on the left must yield to the car on the right.

The reason why "The driver on the left must yield to the car on the right" would be the correct answer because this would be known as the same time rule.

An open intersection is pretty much known as a place where you need to be prepared to stop, in which all drivers that approach the intersection are obligated to make a stop and let anyone that has the right of way go first.

But, not everyone comes in different times. There are times where two drivers end up stopping at the intersection at the same time. The driver on the left must yield to the driver on the right because it will allow the flow of traffic to keep on going. The driver on the left will still have time to get to the destination that they're travelling to

answer; i believe that the correct answer is (decreased)

what words? are you talking about to complet what sentence