An officer signals to you by moving his arm alternately up and down. What should you do?
A)Turn toward the side indicated by the arm.
B)Stop immediately on the right.
C)Reduce speed.Correct
# Explanation
When a traffic officer moves his arm alternately up and down, he is indicating that **you should reduce speed**. This signal is used to warn drivers of a hazardous situation or congestion on the road. It is neither an order to stop nor to turn, but rather a warning for you to gradually reduce your speed.