You read through a blog post your colleague created and you realized it’s on more than one topic. Is this a good or bad thing?

You read through a blog post your colleague created and you realized it’s on more than one topic. Is this a good or bad thing?
  A)  Good – you’re able to make your blog post longer and it addresses several of your prospects questions.
  B)  Bad – it’s better to focus on one topic per blog post to keep it clear and concise.
  C)  Good – the post will be easier to optimize for search engine optimization and ranking for several different keywords.
  D)  Bad – the blog post will be too long for search engines to crawl effectively.