Blondin and Farini were tightrope walkers who crossed Niagara Falls on the high wire in a series of increasingly incredible ways.
<h3>Who are called tightrope walker?</h3>
Tightrope walkers are the people who balance on a rope in high altitudes. Blondin and Farini, both, were the tightrope walkers. Both were titled as The great tightrope walkers. They both crossed the Niagra fall.
Thus, the correct option is D.
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