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Verbal·Standard English Conventions·Form, Structure, and Sense

hard

In the 4th century BCE, ancient Greek philosopher Aristotle proposed that objects move only if it is in their nature to move. This theory        to explain the fundamental principles of motion, though widely accepted for a time, eventually lost favor among members of the scientific community.

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

A

attempts

B

was attempting

C

attempted

D

attempting