Which of the following can affect the performance of windshield wipers?

Windshield wipers are critical for maintaining visibility during adverse weather conditions, and their performance can be significantly impacted by several factors. Worn-out blades can lead to inefficient cleaning of the windshield, resulting in streaks or missed spots that hamper visibility. A malfunctioning motor can also prevent the wipers from operating at the correct speed or not working at all. Therefore, the physical condition of the wiper blades and the proper functioning of the motor directly influence how effectively the wipers clear rain, snow, or debris.

While other factors like incorrect window tint or the type of windshield washer fluid can affect overall visibility or clarity, they do not directly impact the mechanical performance of the wipers themselves. Similarly, the condition of the vehicle's tires, while crucial for overall driving safety and handling, has no relevance to the operation of windshield wipers. Thus, the correct choice highlights the critical aspects that directly influence wiper performance.