Question

select the text from the paragraph that best helps you understand that gorge means a narrow opening between cliffs. there may be more than one correct choice. the niagara river drops about 176 feet at the famous niagara falls. below the falls, the river rushes through a deep gorge. for many years, the only way across the rushing river was by boat. people thought no bridge could ever be built between those steep rock walls. but in 1848, a kite contest changed that. a prize was offered to anyone who flew a kite across the river. a boy named homan walsh won. his kite string went eight hundred feet from one side to the other. bridge builders tied a stronger line to that string, and then a rope. and that was the start of a great bridge.

Explanation:

The phrase "between those steep rock walls" helps understand that a gorge is a narrow opening between cliffs. The description of the location (between steep rock walls) gives context to the term "gorge" as a narrow space (the opening) flanked by cliffs (the steep rock walls).

Answer:

between those steep rock walls