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Verbal·Expression of Ideas·Transitions

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In 1940, scientists first isolated a sample of the steroid hormone androstenone, which they knew existed in animals--and, they assumed, only in animals.        scientists know that androstenone can also be found in chokecherry plants (Prunus virginiana), but this discovery didn’t occur until decades later.

Which choice completes the text with the most logical transition?

A

Today,

B

For instance,

C

In other words,

D

Thus,