Hey All,
Lots of great conversation surrounding this one. At
MGMAT, we use this question to demonstrate a fundamental rule of sentence correction, namely that the correct answer often sounds terrible. The reason the correct answer here sounds so bad (and why many of you didn't pick it), is because of the use of the rare idiom so X as to Y, and the present participle. I'll explain:
Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more dependent on information-based industries.
(A) lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming
PROBLEM: So x as to Y is the idiom, as many of you pointed out. Also, the subject of "to absorb" is highly unclear. Who's absorbing them?
(B) lack math skills to a large enough degree that they will be difficult to absorb into a city’s economy that becomes
PROBLEM: "large enough degree that" is not idiomatic. "City's economy" makes it seem that there is some specific city, which is odd (though not inherently wrong). Finally "becomes" makes it seem as if this hasn't happened yet, but the point is that it is happening at present.
(C) lack of math skills is so large as to be difficult to absorb them into a city’s economy that becomes
PROBLEM: You can't really have a "large" "lack of math skills". Same two points at the end as before.
(D) are lacking so much in math skills as to be difficult to absorb into a city’s economy becoming
PROBLEM: Again, the so X as to Y is wrong. City's economy remains weird.
(E) are so lacking in math skills that it will be difficult to absorb them into a city economy becoming
ANSWER: So X as to Y is correct. Becoming is a present participle modifying city economy, and it makes it clear that this is currently happening.
For what it's worth, all of these answer choices also have an ambiguous pronoun ("them" could be math skills or students), but apparently GMAT figured it wasn't important here. Silly GMAT.
Hope that helps!
-tommy