题目：
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.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析： 恩格尔系数是食品支出总额占个人消费支出总额的比重。它说明，一个国家或家庭的恩格尔系数越少这个国家或家庭的经济越富裕。
