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Verbal·Standard English Conventions·Form, Structure, and Sense
hard
In 1862, Scottish physicist James Clerk Maxwell proposed that light requires an ether to propagate. This theory        to explain the nature of light, 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
attempting
D
attempted