Assess the following business scenarios to determine which ones would benefit most from focusing on social media channels for organic user acquisition:
- Scenario A: A company specializing in custom-made office furniture is looking to expand its market reach and build brand awareness.
- Scenario B: An emerging fitness brand aims to connect with a younger audience by showcasing workout routines and healthy lifestyle content.
- Scenario C: A local bookstore focuses on curating rare and vintage books, aiming to attract a specific group of book enthusiasts.
- Scenario D: A new tech startup developing innovative home automation solutions wants to educate potential customers on the benefits of smart homes.
Identify the scenarios where utilizing social media channels for organic growth would be most effective.