If there is no specific signage, what is the maximum speed we will have on this road?

If there is no specific signage, what is the maximum speed we will have on this road?
A)30 km/h.Correct
B)20 km/h.
C)50 km/h.
The sign indicates the entrance to a built-up area, so once the sign is passed, the rules relating to built-up areas will apply.
The general speed limits on urban roads, depending on the characteristics of the roadway, are as follows:
a) 20 km/h on roads that have a single platform for the carriageway and sidewalk.
b) 30 km/h on roads with a single lane per direction of travel.
c) 50 km/h on roads with two or more lanes per direction of travel. (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 following 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, following specific signage.