Final answer:
A driver with their left arm extended upwards is signaling their intention to make a right turn.
Step-by-step explanation:
When a driver extends their left arm, bent and pointing straight up, they are indicating their intention to make a right turn. This hand signal is part of the standardized driving hand signals which are important for safe and clear communication with other road users, especially when turn signals are not functioning or to reinforce the electronic turn signals. The options provided in the student's question all related to possible actions a driver can take, with a right turn being the correct answer.