Which sentence has correct subject-verb agreement?

What is a proverb? a paragraph or short essay in which a writer expresses his or her opinion on a topic using a main idea and key points a phrase or short sentence that expresses a rule everyone should follow or a rule that we should all try to live by a sentence or short paragraph that shares a story through which the reader can learn a valuable lesson about life a short saying, usually of unknown and ancient origin, that expresses effectively some commonplace truth or useful thought