Mashaal Masha
Emperor penguins don't waddle out of the ocean. They launch themselves at such a high speed that they travel up to two meters before landing. How ________ A layer of microbubbles on their plumage reduces friction as the penguins speed to the surface.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A: 

they are able to move so fast!

B: 

are they able to move so fast.

C: 

they are able to move so fast.

D: 

are they able to move so fast?

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