Which USPS service offers free tracking for its items?

The correct answer, which indicates that Express Mail offers free tracking for its items, is accurate because this service is designed for expedited shipping and includes comprehensive tracking as a standard feature. Express Mail provides customers with real-time updates on the status and location of their shipments, ensuring they can monitor their package throughout the delivery process. This is particularly valuable for urgent documents and items, where timely delivery is essential, and tracking is a critical part of the service provided.

While other services like Priority Mail do offer tracking and are also well-regarded for speed and reliability, the specific labeling of "Express Mail" in the context of the question highlights its emphasis on speed and the fact that tracking is an inherent feature of this service. In contrast, while First-Class Mail and Parcel Select may have limited tracking options or may require additional fees for tracking, they do not embody the same level of guaranteed tracking and service commitment associated with Express Mail.