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Verbal·Standard English Conventions·Boundaries

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Early neurobiologists theorized that the adult mammalian central nervous system was entirely post-mitotic and incapable of generating new functional neurons.        in the late 1990s, researchers utilizing bromodeoxyuridine (BrdU) pulse-chase labeling demonstrated active adult neurogenesis within the subgranular zone of the human dentate gyrus.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

However,

B

Likewise,

C

Therefore,

D

Moreover,