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Verbal·Standard English Conventions·Boundaries

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At 4,000 years old, the Ancient Yew, a common yew (Taxus baccata) located in the United Kingdom, is one of the oldest known trees in the world. With four millennia of climate data in its tree rings, a single tree like this, claims __________ Valerie Trouet, can tell the history of the world.

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

A

dendrochronologist:

B

dendrochronologist,

C

dendrochronologist—

D

dendrochronologist