Sending the right email to the right person is about creating the right content with the right context. Which of the following is MOST useful in determining an email’s context?

Sending the right email to the right person is about creating the right content with the right context. Which of the following is MOST useful in determining an email’s context?
  A)  The best time of day to send emails
  B)  The lead’s stage in the Buyer’s Journey
  C)  The top performing content in past emails
  D)  The pain-points associated with a persona segment