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
Note "such firms" in the latter part of sentence.
B is the only choice that uses "firms" required by such firms.