Which of the following describes the rationale for administering vitamin K to every neonate（）

A. Neonates don’t receive the clotting factor in utero.

B. The neonate lacks intestinal flora to make the vitamin.

C. It boosts the minimal level of vitamin K found in the neonate.

D. The drug prevents the development of phenylketonuria (PKU).

新世纪百货商场一件商品标价480元，商场的优惠活动是满300元减120元，实际上这件商品打了（    ）折。