Mo2men
Dear
mikemcgarryI hope you are well and in safe place away from those horrible hurricanes.
I have 2 questions about the sentence at hand as follows:
1- In choice
'D', If '
increased' is replaced by '
grew', is there any subtle difference?
2- regardless of using 'the numbers of', I do not understand why is Choice B wrong? What is the difference between '
increased/grew' and '
increased/grew by'?
Thanks in advance
Dear
Mo2men,
Good to hear from you, my friend.

Yes, I am sunny northern California, over 1000 miles away from Hurricane Harvey. I feel very bad for those folks, but it is nowhere close to me or my family. Thank you for your concern. I'm happy to respond.
1) In choice
(D), replacing "
increased" with "
grew" would produce the exact same meaning. If there's any difference at all, it's that "
grew" sounds a shade less formal, a shade less sophisticated, than does "
increased." The GMAT would
never test such a minute subtle difference and expect you to know this, but notice that the OA winds up being on the slightly more sophisticated side--that's a frequently GMAT SC feature.
In case you're interested, I'll share: the English language has two major sources. The first is Latin, through the early French language, and most Greek came into the language by that route. The second is the Anglo-Saxon side, through which it is related to German. The "Latin" side of English tends to be the long multisyllabic words--the
-tion words, the
-ity words, the
-fic words, etc. The "German" side of English tends to be short monosyllable words packed with meaning--the forms of the verbs
be,
have,
come,
go, etc.; the -
ough words, etc. As a very rough general rule, the "Latin" side of English is considered more high brow than the "German" side of English. The word "
grew" is from the German side, and the word "
increase" is from the Latin side, so the latter automatically sounds slightly more sophisticated. All of this is way way more than you would ever need to know for the GMAT, but it may help you some day in your own writing.
2) The structures "
increased by more than 35%" or "
grew by more than 35%" are also 100% fine. It's redundant, though, to say, "
grew by a 35% increase."
Does all this make sense?
Mike