What must drivers do when they see a no right turn sign?

Answer: C — Proceed straight or turn left

When drivers see a no right turn sign, they are prohibited from making a right turn at that intersection. This means the correct course of action is to proceed straight or turn left. This rule is in place to ensure the safety of all road users and maintain smooth traffic flow. The sign clearly indicates that a right turn is not allowed, so drivers must redirect their choices accordingly. It's important for drivers to be attentive to such signs to avoid violations that could lead to fines or accidents, as disregarding the sign could create hazards for themselves and others on the road. Following the instruction to proceed straight or turn left not only complies with traffic regulations but also contributes to a safer driving environment.