帮忙解释一道GWD的数学题

谁能帮忙给我解释解释这道题目？怎么就不明白它什么意思呢。。。呜呜呜

Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m.  By what percent did the ratio of price per share to earnings per share increase, in terms of k and m?

A.       k/m%

B.     (k – m) %

C.     [100(k – m)] / (100 + k) %

D.     [100(k – m)] / (100 + m) %

E.      [100(k – m)] / (100 + k + m) %

谢谢啦

thanks