An analyst does research about net profit margin. A company has only fixed rate debt outstanding and reports its debt using the fair value option. Which of the following statements is most accurate when market interest rates decrease（）

A. The company's net profit margin decreases.

B. The company's net profit margin remains the same.

C. The company's net profit margin increases.

急性左心衰可选用（）

A.地高辛

B.毒毛花苷K

C.吗啡

D.呋塞米

E.氨茶碱