Under which condition would your stopping distance likely be longest?

Choosing wet pavement as the condition under which stopping distance would likely be longest is correct because wet surfaces significantly reduce tire traction. When the road is wet, the water creates a film that can lead to hydroplaning or slipping, which prevents tires from gripping the road effectively. This means that vehicles require a longer distance to come to a complete stop compared to dry surfaces where traction is maximized.

In contrast, dry asphalt and paved roads provide better grip and allow for shorter stopping distances. Dry gravel, while offering less traction than smooth surfaces, typically has more give and can still allow for reasonable stopping distances compared to wet conditions. Thus, wet pavement presents the greatest challenge to safe stopping due to its impact on traction.