GMAT Sentence Correction (SC) | Re: As virtually all the nation's 50 busiest airports are

As virtually all the nation's 50 busiest airports are, New York's were built for an age of propellers, before jet planes weighing 800,000 pounds needed over two miles of runway.

You need clause after as if it is a case of comparison so B ruled out
(A) As virtually all the nation's 50 busiest airports are
(B) As with virtually all of the nation's 50 busiest airports:
You need clause after as if it is a case of comparison so B ruled out

(C) Like virtually all of the nation's 50 busiest airports

(D)