challenge: Why did Casey Newton decide to move Platformer off Substack in January 2024?
  
  A. Because of Substack's decision to increase the advance offered to authors
  B. Due to Substack's changes in its healthcare stipend policy
  C. As a result of Substack's changes in its subscription pricing model
  D. In response to Substack's handling of pro-Nazi publications on its platform
  Answer: 