Final answer:
The best utility for synchronizing, upgrading, and performing a factory restore on iOS devices is iTunes. It allows for media management, backup, and system updates. On Macs with macOS Catalina and later, Finder replaces iTunes for device management.
Step-by-step explanation:
The utility that best describes the tool used with iOS devices to synchronize, upgrade, and restore to factory default if needed is B. iTunes.
iTunes was originally designed as a media player and library, but also provided device management capabilities for iOS devices.
With iTunes, users could manage their music and other media, backup and restore their devices, update to the latest version of iOS, and even restore their devices to factory settings if troubleshooting was necessary.
However, starting with macOS Catalina, Apple replaced iTunes with Finder for device management on Macs, and iTunes remains available on Windows for these functions.