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.
The sente of sound is D.Watch
I believe that the message the author is trying to convey in this excerpt is that humans need to take action to end further destruction of the natural environment, because if they don't, more and more species will disappear.
I think it's the first sentence because a noun phrase contains is or contains the subject and Hikers is the subject.
