The Nurse Is Explaining the Process of Fertilization to a Patient

The nurse is explaining the process of fertilization to a patient who has just learned of being pregnant. On which day during pregnancy should the nurse explain that the embryo implants on the uterine surface?

A) Four days after fertilization
B) Eight to 10 days after fertilization
C) The 14th day of a "typical" menstrual cycle
D) Ten days after the start of the menstrual flow