Final answer:
Worn tires cause difficult turning, hydroplaning, and increased stopping distance, hence the correct answer is d) all of the above. Examples of when increased friction is beneficial include driving with winter tires on icy roads.
Step-by-step explanation:
Worn tires can indeed be the cause of multiple issues while driving. They can lead to difficult turning as the grip on the road surface is reduced, which makes it harder to steer the vehicle accurately. Additionally, hydroplaning is a risk when tires are worn because they can't effectively channel water away from the tread, which can result in a loss of traction and control. Lastly, worn tires can cause an increased stopping distance due to the reduced ability to create friction between the tire and the road, making it harder to stop quickly. Therefore, the answer to the question is d) all of the above.
An example of a situation where more friction is desirable is when driving over icy roads using tires designed specifically for those conditions, such as winter tires with deeper grooves and more biting edges compared to summer tires.