How is paragraph 7 important to the central idea that the Brooklyn Bridge was a difficult project to complete?
A. It shows that instead of using iron wires for the cables, Roebling
used steel wires.
B. It shows that the cables were formed in the air instead of on the
ground.
C. It shows that there were many accidents during the construction of
the cables.
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D. It shows that the cables were not strong enough once they were
put in place.