This signage prohibits parking...
A)on the through road.
B)from the point directly below the sign to the next intersection.
C)throughout the entire built-up area.Correct
When we find a regulatory sign placed beside or directly below a sign indicating a built-up area, it means that said regulation will apply throughout the entire built-up area, unless a different regulation is indicated within it through other signs.
In this case, parking will be prohibited throughout the entire built-up area.