The three trends are streaming on TV, short-form content, and shopping on YouTube which advertisers should know about to better understand how the platform can help them achieve their goals.

1. The trends are streaming on TV, audio-only content, and shopping.
2. The trends are cross-device behavior, short-form content, and shopping.
3. The trends are streaming on TV, short-form content, and shopping. 
4. The trends are cross-device behavior, audio-only content, and shopping.

The correct answer is: The trends are streaming on TV, short-form content, and shopping.

Explanation: To showcase YouTube’s effectiveness in achieving marketing goals, highlight these three user trends for your client: (1) The rise of streaming on TV – CTV is YouTube’s fastest-growing segment with more than 700 million daily watch hours; (2) The dominance of short-form content – YouTube Shorts has become the world’s leading short-form platform, catering to users’ entertainment and informational needs; (3) The shift to digital shopping – YouTube is a crucial platform for obtaining reliable product information, aiding users in making educated purchases.