If a vehicle drives along this road at 90 km/h, is it doing so at an appropriate speed?

If a vehicle drives along this road at 90 km/h, is it doing so at an appropriate speed?
A)Yes, since it is the maximum permitted.
B)No.
C)No, since it is excessive due to the circumstances.Correct
On this road, the maximum permitted speed is 90 km/h, but the appropriate speed, due to the dangers indicated by the sign and the road conditions, must be lower than the maximum permitted.
Driving at an appropriate speed means we must drive at a speed adapted to the circumstances of each moment.