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Verbal·Standard English Conventions·Boundaries

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At 1,066 years old, RCH 3, a foxtail pine (Pinus balfouriana) located in the United States, is one of the oldest known trees in the world. With almost two millennia of climate data in its tree rings, a single tree like        claims dendrochronologist 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

this:

B

this;

C

this

D

this,