This sign prohibits entry to...
A)all vehicles intended for the transport of goods.
B)all vehicles intended for the transport of dangerous goods.
C)trucks and vans.Correct
The sign in the question prohibits entry, on the road where it is placed, to vehicles intended for the transport of goods, understood as trucks and vans regardless of their weight.
The sign does not prohibit entry to ALL vehicles intended for the transport of goods. For example, a car-derived vehicle that may be used exclusively for the transport of goods will not have its entry prohibited.
Do not confuse the sign in the question with the one that prohibits access depending on the maximum authorised mass.