Which of the following is a downside to breastfeeding?

A) An increased risk of early breast cancer and ovarian cancer in mothers
B) An increased risk of transmission of HIV to infants by infected mothers
C) An increased risk of childhood lymphoma in infants
D) The likelihood of infants developing serious cases of diarrhea

Breastfeeding can transmit HIV from an infected mother to her infant, which is a recognized downside in cases where the mother is HIV positive. The other options listed are not accurate downsides of breastfeeding; in fact, breastfeeding has been shown to reduce the risk of breast and ovarian cancer in mothers, does not increase the risk of childhood lymphoma, and helps protect infants against serious cases of diarrhea.