I am not happy with the explanation of option C. I believe option C is incorrect because 1) "Local Times" still differ thus the use of past tense "was differing" is incorrect. 2) The past continuous "was differing" cannot be used in isolation. We use past continuous in ...

Is this a real GMAT question? On some other websites related to GMAT the original sentence does not have an "of". Since the start of space age, more and more littering has occured in orbits near Earth, often because of the intentional discarding of lens caps, packing material , fuel tanks ...

Let us wait for Ron's comment. Thank you Ron, I agree with you that the choice E is more paralel because the second half of comparistion contains "were" as the first does but look at choice D. D is still clear and not ambiguous. D can be a correct answer in other sc problems. and looking a...