Reservation signs

Signs

A pedal cycle lane is going to be reserved exclusively for your bicycles, right? So, motor vehicles are not going to be allowed in this lane under any circumstances. Therefore, option A is going to be correct. Only bicycles may use this lane, all other vehicles are prohibited.
A reserved lane sign, especially this one, is only going to be legally designated for a specific class of vehicles, right? And in this case, it's going to be for buses and authorised public transport vehicles. Therefore, option C would be correct.