Final answer:
A right turn hand signal is performed by extending the left arm out of the window and bending the elbow at a 90-degree angle with the palm facing forward, indicating an upwards pointing gesture.
Step-by-step explanation:
A right turn hand signal is indicated by the left arm and hand pointing up (option b). This signal is essential for safety on the road when turning right.
To use this signal, the driver extends their left arm out the window with the elbow bent at a 90-degree angle and the palm facing forward, creating an upwards pointing gesture. This is one of the standard hand signals recognized by road users and is important when the vehicle's turn signals are not functioning or when it is required to signal manually.