The path of a stunt car that is driven off a cliff follows a curve typical of a projectile.
Recall that in a projectile motion, there are two types of velocity components
Horizontal velocity component
Vertical velocity component
The vertical component of the car's velocity keeps on changing due to the gravitational acceleration.
On the other hand, the horizontal component of the car's velocity is independent of the gravitational acceleration meaning that it has no effect on it.
This is the reason that the horizontal component of velocity never changes.
Below is the illustration of the concept
You can see that the vertical component of the velocity is changing but the horizontal component of velocity does not change.
Therefore, we can conclude that the horizontal component of the car's velocity at the beginning and the horizontal component of the car's velocity before hitting the ground is the same.
Hence, option B is the correct answer.