What is a primary use case for Lookalike Audiences?

A. To maximize the reach and relevance of targeting ads to Facebook audiences

B. To help marketers target ad delivery to people similar to ones they already know

C. To reconnect with and remarket to existing customers and clients

D. To drive conversions by targeting website visitor and people who use your app

correct answer:

B. To help marketers target ad delivery to people similar to ones they already know

explanation and source:

Lookalike audiences try to match characteristics of people who already have a relationship with your Page or business. https://www.facebookblueprint.com