Final answer:
When using hand signals while driving, an arm extended straight out the window indicates that the driver intends to make a c. left turn.
Step-by-step explanation:
When using hand signals while driving, if the driver's arm is straight out, it indicates a left turn. This is a universally recognized signal which can also be important if a vehicle's turn signals are not functioning. The driver extends the left arm out of the vehicle window and keeps it straight to signal the intention to make a left turn to other road users. Similarly, a right turn is usually indicated by extending the left arm out with the elbow bent upward at a right angle, and stopping is indicated by extending the left arm out with the elbow bent downward at a right angle.
When using hand signals while driving, if the driver's arm is straight out, it means a left turn. This is an important signal to indicate to other drivers and pedestrians that you intend to turn left. It is essential to use hand signals in addition to using turn signals on your vehicle to ensure clear communication on the road.