Which is the MOST important reason why blog post title length matters?

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Which is the MOST important reason why blog post title length matters?
  A)  Titles under 200 characters in length have the best click-through rate.
  B)  The length of your blog post doesn’t matter as long as it’s enticing.
  C)  You want your full title to be seen on a search engine results page to help with the click-through rate.
  D)  If the title is too long it will be cut off on social media.
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.