GMAT Sentence Correction (SC) | Re: In a leveraged buyout, investors borrow huge sums of money

In a leveraged buyout, investors borrow huge sums of money to buy companies, hoping to pay off the debtby using the company’s earnings and to profit richly by the later resale of the companies or their divisions.

(A) by using the company’s earnings and to profit
(B) by using the companies earnings and by profiting
(C) using the companies’ earnings and profiting
(D) with the company’s earnings, profiting
(E) with the companies’ earnings and to profit

What is the rule here? why is E