Official Explanation:
Choice E
Classification: Pronoun Usage
Snapshot: This problem is included to highlight ambiguity arising from the use of personal pronouns, and seeks to clear up such ambiguity, not by replacing pronouns, but by rearranging the sentence itself. Part of the reason it garners a three-chili rating is because the problem is long, and somewhat difficult to read and analyze in two minutes—the standard time allotted for completing any and all multiple-choice GMAT problems.
Choices A and B use the word “they” to refer to traditional businesses; this is illogical because traditional businesses are not growing, Internet companies are. Remember that a pronoun modifies the closest noun that precedes it. The structure in choice C makes it seem as if “financial formulas” are growing, and this, of course, is farcical.
Choices A and C use the awkward clause “do not apply to X in the same way as they do to Y.” A more succinct rendition is found in choice E—“do not apply to X in the same way as to Y.” In choices A, C, and E, the verb “apply” is more powerful and, therefore, superior to the noun form “applicability,” which appears in choices B and D.
NOTE Beware of the high school wise tale that says you shouldn’t begin a sentence with the word “because.” If you learned this as a rule, forget it. According to the conventions of Standard Written English (SWE)—which, incidentally, this book abides by—the word “because” functions as a subordinating conjunction. Its use is effectively identical to that of “as” or “since,” and we can think of these three words as substitutes. In short, there’s actually no rule of grammar or style preventing us from beginning a sentence with the word “because.”