At 100 km/h on a road signposted in this way, are you driving at an appropriate speed?

A)No, because the recommended speed is 120 km/h.
B)Yes, provided traffic and road conditions allow it.Correct
C)Yes, as long as it does not obstruct traffic.
Every driver is obliged to respect the established speed limits.
In addition, they must take into account their own physical and mental conditions, the characteristics and condition of the road, of the vehicle and its load, weather, environmental and traffic conditions, and, in general, all circumstances present at any given moment, in order to adapt the speed of their vehicle accordingly, so that they can always stop within the limits of their field of vision and in the face of any obstacle that may arise. Driving in accordance with the above is driving at an appropriate speed.
On motorways and dual carriageways, the maximum speed limit is 120 km/h, but there will be circumstances in which driving at that speed would be driving at an inappropriate speed, despite being within the established limits.
On motorways and dual carriageways, the maximum speed limit is 120 km/h, but there will be circumstances in which driving at that speed would be driving at an inappropriate speed, despite being within the established limits.