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Verbal·Standard English Conventions·Boundaries
hard
Chondrites are stony meteorites that are undifferentiated—that is, their contents have not melted and separated into distinct layers. They are rarely        many chondrites experience aqueous alteration as a result of exposure to fluids, as well as fracturing, veining, and localized melting due to collisions with other objects.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
pristine, though;
B
pristine; though
C
pristine, though
D
pristine, though.