Can you ride a motorcycle with a class B licence?

A)Yes, if it has an engine displacement of less than 250 cubic centimetres.
B)Yes, as long as it does not exceed 25 kW of power.
C)Yes, only in Spain, with a maximum engine displacement of 125 cubic centimetres, and with a licence seniority of more than three years.Correct
Persons holding a class B licence with more than three years' seniority may ride, within national territory, the motorcycles authorised by the class A1 licence, which are: motorcycles with a maximum engine displacement of 125 cm³, a maximum power of 11 kW and a maximum power-to-weight ratio of 0.1 kW/kg, and motor tricycles whose maximum power does not exceed 15 kW.