Postal Service Practice Exam 2025 – Comprehensive Study Resource

The choice of Priority Mail Express is the correct answer because it is the only mail service offered by the United States Postal Service that guarantees delivery in a specific time frame. This service includes features such as overnight delivery to most U.S. addresses, tracking, and a guaranteed delivery date and time, which sets it apart from other options.

Priority Mail, while reliable and typically fast, does not come with a guarantee of delivery within a specific timeframe. Standard Mail is primarily used for bulk and advertising mail and does not guarantee delivery times, often taking longer than other types of mail services. International Mail varies widely in delivery times and lacks the assurance of guaranteed delivery, mainly because international processing can be unpredictable.

Thus, the combination of fast delivery, tracking capability, and a commitment to a specific delivery timeline makes Priority Mail Express the only option that ensures delivery, clarifying its distinction from the other services listed.