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Verbal·Standard English Conventions·Boundaries

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In high-pressure physics, metallic hydrogen remains one of the most elusive condensed-matter phases        theorists predict that at pressures exceeding 400 gigapascals, molecular hydrogen will dissociate into a dense lattice of atomic nuclei exhibiting room-temperature superconductivity.

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

A

—indeed,

B

; indeed,

C

, indeed,

D

: indeed,