Mashaal Masha
To survive when water is scarce, embryos inside African turquoise killfish eggs ________ a dormant state known as diapause. In this state, embryonic development is paused for as long as two years--longer than the life span of an adult killfish.

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

enter

B: 

to enter

C: 

having entered

D: 

entering

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