During what situation should you use extra caution when making a left turn?

Answer: C — When there are oncoming vehicles

Using extra caution when making a left turn is particularly important when there are oncoming vehicles. This situation poses a higher risk because you must cross oncoming traffic lanes to complete your turn. The presence of oncoming vehicles can create potential hazards, such as the risk of a collision if the other driver is speeding or if there is an unexpected movement on their part. Being vigilant and ensuring the road is clear from both directions before proceeding with the turn helps increase safety for both yourself and other road users. In contrast, making a left turn in daylight, at an intersection without vehicles nearby, or when there is no traffic does not typically require the same level of caution because these conditions present a lower risk of encountering unexpected obstacles or hazards.