Shirley Returned to Full-Time Employment Six Weeks After Her Baby's

Shirley returned to full-time employment six weeks after her baby's birth. She exclusively breast-fed during her maternity leave, and then pumped her breast milk when she returned to work. Now her baby is three months old and drinks some formula when at daycare. Shirley wants to stop breast-feeding. If you were a pediatric nurse, what would you say to her?

A) She can quit breast-feeding since all of its benefits are achieved within the first three months.
B) She should quit breast-feeding since it is only beneficial if the baby doesn't drink any formula.
C) She should keep breast-feeding until the baby begins to eat solid foods, which is the point at which breast milk loses its nutritional value.
D) She should keep breast-feeding as long as possible since breast-fed babies are less likely to get sick.