请教一道石林语法，谢谢

Because of the enormous research and development expenditures required to survive in the electronics industry, an industry marked by rapid innovation and volatile demand, such firms tend to be very large.

a. to survive

b. of firms to survive

c. for surviving

d. for survival

e. for firms' survival

石林上课时候说因为题干出现such firms, 所以前面必须提到firm,排除a,c,d. 所以选b, 那为什么不能选e呢？谢谢。

一般是人等有生命的事物才用结构's，否则用of结构。