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Verbal·Expression of Ideas·Transitions

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With many elements, like osmium, scientists were able to isolate a relatively pure sample of the substance shortly after discovering its existence. __________ this wasn’t the case with all elements. The process of isolating magnesium, for example, took years—53, to be precise.

Which choice completes the text with the most logical transition?

A

Likewise,

B

Granted,

C

In other words,

D

For this reason,