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Verbal·Standard English Conventions·Boundaries

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

The kilns used by the ancient Romans to make concrete extended to heights of 164 feet and diameters of 26 feet. These enormous structures were used to create concrete mixtures that could reach temperatures of up to 250 degrees        such extreme heat enabled unique chemical outcomes impossible when working with cold-mixed materials.

A

Celsius,

B

Celsius

C

Celsius and

D

Celsius;