单选题 A 4-year-old girl is admitted to the hospital to rule out leukemia. Which of the following would be the best room assignment?
A. With a 4-year-old girl who has rheumatoid arthritis.
B. With a 5-year-old boy who is having a tonsillectomy.
C. With a 4-year-old girl who has leukemia.
D. Alone in a private room.