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Verbal·Standard English Conventions·Boundaries

hard

Released in 1999, the Intel Pentium III microchip contained a single CPU, or core, to execute commands. Since then, the average processing power of microchips has __________ cores now number in the dozens, hundreds, or even thousands—that the once-revolutionary dual-core technology that replaced the single-core chip can be found in everyday items like toasters and toothbrushes.

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

A

increased—so drastically,

B

increased so drastically,

C

increased so drastically—

D

increased, so drastically,