On an urban road with a single platform for roadway and sidewalk, what is the maximum speed at which we can drive?

On an urban road with a single platform for roadway and sidewalk, what is the maximum speed at which we can drive?
A)30 km/h.
B)20 km/h.Correct
C)50 km/h.
The general speed limits on urban roads, depending on the characteristics of the roadway, are as follows:
a) 20 km/h on roads with a single platform for roadway and sidewalk.
b) 30 km/h on roads with a single lane in each direction.
c) 50 km/h on roads with two or more lanes in each direction. (40 km/h for vehicles transporting dangerous goods)
For these purposes, lanes reserved for the circulation of certain users or for the exclusive use of public transport will not be counted.
These limits may be reduced or increased by the Municipal Authority with prior specific signage.
On through-roads, a limit of 50 km/h is set for all types of vehicles, except for vehicles transporting dangerous goods, which will be 40 km/h. This limit may be reduced by agreement of the Municipal Authority with the road owner, with prior specific signage.