You’ve written two versions of a marketing email that differ based on their first paragraphs. Both get across your message, but you’re not sure which email version to use. Which of the following is the BEST way to determine which email is most effective?

You’ve written two versions of a marketing email that differ based on their first paragraphs. Both get across your message, but you’re not sure which email version to use. Which of the following is the BEST way to determine which email is most effective?
  A)  Send each email to different segments
  B)  A/B Test
  C)  Click popularity tracking
  D)  Click-through rate analysis