What Information Would Be Most Important for a Doctor to Share

What information would be most important for a doctor to share with a breastfeeding woman?

A) She will not get her period and cannot become pregnant until she stops breastfeeding.
B) She may get her period but cannot become pregnant until she stops breastfeeding.
C) She may become pregnant before her period returns.
D) Her period will not return until she returns to her pre-pregnancy level of body fat.
E) She is likely to experience heavier menstrual bleeding than usual.