Which label provides the best evidence for each of the statements about the passage?

your answer is c) experiments with water vapor showed that elements combine in specific proportions.

the following what exactly?

where is the graph?

i only can answer with a graph!

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.