Which Apple service allows users to track lost devices?

The service that allows users to track lost devices is Find My iPhone. This feature is part of Apple's broader Find My application, which helps users locate their Apple products, such as iPhones, iPads, Macs, and even AirPods. When a device is lost, users can log into the Find My app or access it via iCloud.com to see the device's last known location on a map. This is particularly useful for recovering devices that are misplaced or stolen, as it also provides options to lock the device, display a message, or erase it remotely to protect personal data.

The other options do not provide tracking capabilities. iCloud Drive is a cloud storage service for files, Apple Music is a streaming service for music, and Apple Pay is a mobile payment service; none of these services offer functionality for locating lost or misplaced devices.