Isabella Is Scheduled to Spend Two Months in Africa, Beginning

Isabella is scheduled to spend two months in Africa, beginning next week, to assist in a medical clinic as part of a Physicians Without Walls team. She just learned that she is pregnant. The clinic in Africa treats a high incidence of rubella there. What should Isabella do?

A) Go ahead with her plans because rubella is dangerous to a fetus in the latter half of pregnancy, and Olivia will be back home before then.
B) Change her plans, because rubella exposure is most dangerous to a fetus in the first three months of pregnancy.
C) Go ahead with her plans, because Olivia had rubella when she was a child and is therefore immune.
D) Change her plans, because rubella cases have been nearly wiped out in the United States.