深静脉高营养的目的是：（）。

A.减少静脉炎

B.补充足够的热量、维生素、氨基酸

C.纠正负氮平衡

D.代替口服营养

E.改善身体抵抗力

An analyst does research about yield spread. Which of the following embedded options in a bond is most likely t0 result in the highest yield spread over a comparable option-free Treasury security（）

A. Call option.

B. Floor on a floater.

C. Conversion option.