Focus Assist will automatically hide incoming notifications, so they don't pop up and distract you while you're playing a game, giving a presentation, or using a full-screen application.
Incorrect Answers:
A: Shared Experiences allow you to start a task on one device and finish it on another device.
D: Tablet mode makes Windows 10 more touch-friendly when using your device as a tablet.
References:
https://www.howtogeek.com/435349/how-to-disable-windows-10s-annoying-focus-assist-notifications/