Can someone help ill give more brainlets if its right

Patient has just received an organ transplant which treatment would be most effective in preventing the patient’s body from

Fredrick griffith made a scientific discovery in 1928

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed