Mashaal Masha
A firefly uses specialized muscles to draw oxygen into its lower abdomen through narrow tubes, triggering a chemical reaction whereby the oxygen combines with chemicals in the firefly's abdomen to produce a glow. _______ when the firefly stops drawing in oxygen, the reaction--and the glow--cease.

Which choice completes the text with the most logical transition?
Difficulty: Medium
A: 

For instance,

B: 

By contrast,

C: 

Specifically,

D: 

In conclusion,

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