Question a-fire

3.3 Transitions - Example/clarification transitions (for example, namely)
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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. blank when the firefly stops drawing in oxygen, the reaction—and the glow—cease.

Which choice completes the text with the most logical transition?

A.

For instance,

B.

By contrast,

C.

Specifically,

D.

In conclusion,