Mashaal Masha
Because a cycle of lunar phases ________ 29.5 days to complete, it's possible to observe two full moons in a single month, one at the beginning and one at the end.

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

are taking

B: 

have taken

C: 

take

D: 

takes

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