You want to turn right. How should you warn other drivers?
A)With the lights or with the horn.
B)With the arm or with the horn.
C)With the turn signal or with the arm.Correct
# Explanation
To turn right, you must warn with the **turn signal** (light signal) or with the **arm** (hand gesture). The turn signal is the main and mandatory method in modern vehicles, while the arm gesture is a valid alternative, especially useful when the electrical system fails. The horn is not a suitable way to signal a change of direction.