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Verbal·Standard English Conventions·Boundaries

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Scientists have figured out why       . The hazy middle layer of Uranus’s atmosphere is much thicker than Neptune’s, making Uranus appear lighter in color.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

is Uranus a different shade of blue than Neptune?

B

Uranus is a different shade of blue than Neptune?

C

Uranus is a different shade of blue than Neptune.

D

is Uranus a different shade of blue than Neptune.