At this crossing, what must be done?
A)Stop only if vehicles are approaching from the right.
B)Stop only if vehicles are approaching from the left.
C)Stop and yield to all vehicles approaching from both sides.Correct
# Explanation
At a crossing with a "YIELD" sign (red triangle), you must stop completely and yield to all vehicles approaching from any direction. This rule applies both to vehicles coming from the right and from the left, ensuring the safety of all road users. You cannot continue until you are sure the crossing is completely clear.