Two french brothers invented the hot air balloon. they made the balloon out of paper and filled it with smoke. the smoke warmed the air inside the balloon. this made it lighter than the cool air outside the balloon. it was light enough to rise into the sky.
which sentence best summarizes the passage?

 "Two French brothers built the first hot air balloon, warming the air inside with smoke so it would rise."

This sentence covers who did the action, what the action was, and the end result. The other sentences on give a partial idea of the sequence and full events. 

Delegates: representatives who cast votes at a political party's national convention. binding: if a primary or caucus is “binding” that means the delegates won in that contest are legally bound to vote for a particular candidate at the parties national convention.a primary is a preliminary election used to determine a party's nominee for a specific office. the winner of the party's caucus, or primary, wins the party nomination for that state. then the delegates meet at their party's national party convention, which is a formal gathering of all party delegates from all states.