look here:

https://www.urch.com/forums/gmat-sentenc ... earch.html

Hi

Even in the old thread that you mentioned, the doubt still remains...
The idiom 'required to' is also correct..
Even I feel option (E) is better than (B)

166. 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

My answer: B
"such firms" requires a precedence for reference. eliminates ACD
E : seems like firms is referring to a particular group of firms mentioned before this.

I chose E.why is it wrong?Isn't the idiom "required for" ? I narrowed it to B and E but chose E.

Thanks thetrystero