怎么理解选项b的意思

问题如下：

Which of the following is an advantage of price multiples?

选项：

A.

Price multiples can be comparable across firms, especially internationally.

B.

Price multiples can be used in time series and cross- sectional comparisons.

C.

P/E ratio based on fundamentals will be very sensitive to the inputs.

解释：

B is correct.

Price multiples can be used in time series and cross-sectional companies, which is its advantage.

B是正确的

本题考察价格乘数的优缺点。

A选项，对于不同国家的公司，使用的会计准则不一样，计算出来的利润，收入等都不可比(分母不可比)，则乘数的比较功能失效。A错误

C选项描述正确，但是对于输入值敏感是一个缺点而非优点，所以C错误。

B选项是价格乘数的一大优点，所以B对。