Consider the following scenarios in the context of user acquisition strategies. Which scenario best illustrates the impact of SEO?
- Scenario A: A company's website traffic increases significantly after launching a series of paid social media ad campaigns.
- Scenario B: A blog post optimized for specific keywords starts ranking on the first page of search results, leading to a steady increase in organic site visits.
- Scenario C: An e-commerce platform sees a surge in sales after sending out a promotional email to its existing customer base.
- Scenario D: A mobile app receives higher downloads after a featured review on a popular tech blog.
Identify the scenario that aligns with the impact of SEO on user acquisition.