Final answer:
The question is focused on finding a synonym that represents making a quick decision for express mail service, with 'SpeedyChoice' being the most appropriate answer.
Step-by-step explanation:
The question appears to be asking for the synonym that best matches the reason why a person chose an express service for mail delivery. The options are: A. SpeedyChoice, B. QuickDecision, C. SwiftSelection, and D. FastPreference. Based on the context, the correct answer should convey the idea of making a decision quickly due to the need for speed in delivery. Among the options provided, A. SpeedyChoice is the most suitable as it directly implies that the decision was made swiftly because of the desire for quick mail arrival.