In view of this sign, what distance must we keep from the vehicle in front of us?

A)At least 100 meters.
B)At least 150 meters.
C)The one that allows braking without colliding with the vehicle in front.Correct
As overtaking is prohibited, we must maintain the safety distance, that is, the one that allows us to react and brake without colliding with the vehicle in front of us. In this case it will not be necessary to maintain the distance to facilitate overtaking.
In tunnels and underpasses we must maintain a safety distance with the preceding vehicle of at least 100 meters or 4 seconds. Vehicles with more than 3,500 kg of MAM, 150 meters or 6 seconds.
In tunnels and underpasses we must maintain a safety distance with the preceding vehicle of at least 100 meters or 4 seconds. Vehicles with more than 3,500 kg of MAM, 150 meters or 6 seconds.