What does the open rate of your email indicate?

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What does the open rate of your email indicate?
  A)  That people are enticed to click on the offer in the email
  B)  That your email has converted leads
  C)  That your email is getting to your contacts’ inbox
  D)  That your subject line is effective
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.