The sentence that best summarizes the passage is B) Two French brothers built the first hot air balloon from paper, warming the air inside with smoke so it would rise.
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The answer is <em>C: twisting the handlebars quickly and wiggling the front wheel</em>.
1. Twisting the handlebars quickly: "There is a third movement of the handle bars --a quick twist in the direction the machine is leaning if about to fall."
2. Wiggling the front wheel: [prevent the fall by throwing the balance the other way] " a similar result is accomplished by wiggling the front wheel...a continuous wiggle --changing the balance...-- is necessary to keep it upright."
