Given the following reasoning and answer, what was the question? Aeroplane travels fast. Cargo can be delivered as quickly as possible by aeroplane. Aeroplane is a vehicle.
 The answer: aeroplane

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The question It was important precious cargo, so it was delivered as quickly as possible by means of what?
Options:
- aeroplane
- boat
- ship's hold
- airplane
- ferry