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Verbal·Standard English Conventions·Boundaries
medium
Neither the initial geochemical surveys conducted along the volcanic rift zone nor the subsequently compiled sediment core data        sufficient evidence to substantiate the hypothesis that hydrothermal vents operated continuously during the late Pleistocene epoch.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
provides
B
have provided
C
is providing
D
has provided