To evaluate whether the company's plan of allowing neighborhood hubs to trade truck assignments freely is likely to achieve its intended result of reducing average delivery time across the company, it would be most helpful to know:
(D) Whether certain neighborhood hubs currently have idle trucks at any point during the day
Here's why:
Relevance to the plan's goal: The core idea behind trading trucks is to move them from areas where they are underutilized (idle) to areas where they are more needed. If there are no idle trucks anywhere, then there's no capacity to be reallocated, and the plan won't achieve its goal of moving "more trucks to the neighborhoods that rely on them most intensively."
Direct impact on truck availability: If some hubs have idle trucks, it means those trucks are currently not contributing to deliveries. Reassigning them to busier hubs directly increases the truck capacity where it's needed, potentially reducing delivery times there.
Enabling condition for the plan: The existence of idle trucks in some locations is a necessary condition for the proposed trading system to have any effect. If all trucks are constantly in use everywhere, then trading won't free up any additional resources.
Let's look at why the other options are less helpful:
(A) Whether neighborhood hubs facing tighter shipping deadlines currently use their trucks more frequently than other neighborhoods: While interesting, this doesn't directly tell us if there's excess capacity to be reallocated. A hub could be using its trucks frequently but still be struggling due to insufficient trucks.
(B) Whether neighborhood hubs currently using trucks more intensively achieve shorter delivery times due to having more trucks: This describes a correlation, but it doesn't confirm the cause or if there's an opportunity for improvement through reallocation. It might be that "more trucks" are needed, but it doesn't indicate if those trucks are currently idle elsewhere.
(C) Whether using the company’s own trucks reduces delivery time more effectively than outsourcing to third-party carriers: This is about the general efficiency of in-house operations versus outsourcing, not about the specific effectiveness of reallocating the existing in-house fleet.
(E) Whether neighborhood hubs will be required to record truck-trading activity in a central scheduling system: This is about the logistics and monitoring of the plan, not about whether the plan itself will achieve its stated goal of reducing delivery times. It's important for implementation, but not for evaluating the core premise.
Answer: D