How must the vehicle leaving the unpaved road join the carriageway?

How must the vehicle leaving the unpaved road join the carriageway?
A)By accelerating to reach the maximum speed of the road.
B)By yielding to vehicles on the right.
C)By yielding and at a speed that allows stopping immediately.Correct
When there is no signage regulating right of way, the driver is required to yield to vehicles approaching from the right, except in the following cases:

- Vehicles travelling on a paved road have right of way over those coming from an unpaved one.
- Vehicles travelling on rails have priority over other road users.
- At roundabouts, those already on the circular road have right of way over those attempting to enter.
- Vehicles travelling on a motorway have right of way over those attempting to join it.
In the case of this question, in order to join the road, the driver must check that the carriageway is clear and no vehicles are approaching, or that the distance, position, trajectory and speed of those approaching are such that they allow the manoeuvre to be carried out safely. Otherwise, the driver must abandon and postpone the manoeuvre to a suitable moment, as they are required to yield.