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Bunuel
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Bunuel
The hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain of any flying bird, allowing them to reach a wing-flapping rate in excess of 50 strokes per second.

(D) hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain of any flying bird, allowing it to reach wing-flapping rates of over

I agree with GMATE1 above that "combine" is a strange word choice here. That said, D is the best answer, since all the other choices have critical errors. D still isn't perfect, since it constructs an improper comparison. The "upstroke wing muscles" are correctly compared to "those" (those muscles) "of other birds". But when it comes to the comparison of "downstroke wing muscles", those end up compared to birds themselves, suggesting downstroke wing muscles are the type of flying bird with the lowest strain, which doesn't make sense.
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All options drill down to A, and D,
and in all comparison with other options Correct option is D seems ok :)

(A) The hummingbird combines
X upstroke wing muscles that are proportionally much larger than those of other birds
with
Y downstroke wing muscles that have the lowest recorded muscle strain of any flying bird,
allowing them to reach a wing-flapping rate in excess of 50 strokes per second

(D) The hummingbird combines
X upstroke wing muscles that are proportionally much larger than those of other birds
with
Y downstroke wing muscles that have the lowest recorded muscle strain of any flying bird,
allowing it to reach wing-flapping rates of over 50 strokes per second

I am worried, about the SV agreement and Comparison
First - The bird is singular and verb is plural :?
Second - The comparison between Downstroke wing muscles with Flying birds :?
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