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gmattokyo
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gmattokyo
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engel
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gmattokyo
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Again, most of you got it right.. thnx!
OA:
parallelism grueling.. challenging
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RaviChandra
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A it is thanku
these Questions are good
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BM
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A, due to parallelism. The word "formidably" is designed to throw readers off.
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ykaiim
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IMO A.

formidably is used as an adverb to modify Challenging while Gruelling is correct in its usage.
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calvinhobbes
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A it is.

But what's wrong with C?
Parallelism doesn't require both adj ends with "-ing" riight?
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psychomath
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I go with A.....was down to A and D



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