Final answer:
A driver can make a right turn on red only after stopping fully and when there are no signs prohibiting the turn, ensuring it is safe to proceed.
Step-by-step explanation:
Drivers can make a right-turn-on-red after coming to a full stop under certain circumstances. The correct answer to when a driver can make a right turn on red is option d) There are no signs saying 'No Turn on Red'. According to traffic rules, a driver must come to a complete stop at the red light and may turn right only if there are no signs prohibiting the turn, the way is clear of pedestrians, and it's safe to proceed with consideration to other vehicles. Turning on a yellow light, being waved on by other drivers, or use of hand signals do not constitute legal justification for turning on red.