|Question 15Verbal

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Nicknamed "The Borinqueneers," the US Army's 65th Infantry Regiment has a membership that has included Colonel Juan Cordero Davila, Sergeant First Class Felix Nieves, and thousands of other Puerto Rican servicepeople. In 2016, these soldiers were honored for ____ historic service when President Barack Obama awarded the 65th Infantry Regiment with the Congressional Gold Medal.
Which choice completes the text so that it conforms to the conventions of Standard English?
their
A
there
B
it's
C
they're
D