Which feature allows iOS users to manage their device's storage effectively?

The correct choice emphasizes the importance of storage optimization settings in iOS, which are designed specifically to help users manage their device's storage effectively. This feature aids in automatically identifying and removing unnecessary files such as old message attachments, unused apps, and large files that are seldom accessed.

By leveraging storage optimization settings, users can receive recommendations for clearing space, enabling them to maintain optimal performance on their devices without manual scrutiny of their storage. This includes options like Offloading Unused Apps, which removes apps that are not currently utilized while keeping their data intact for future use. Such features are crucial for enhancing user experience, especially on devices with limited storage capacity.

The other options relate to functionalities that do not directly assist in managing storage. Automatic updates ensure that the device has the latest software but do not influence storage usage. AirDrop is a file-sharing feature, while Siri shortcuts help streamline tasks but neither addresses storage management needs specifically.