Read the secondary source below. how would you know it is not a valid source?
date published: june 15, 2012author: joseph h. ancient greece produced the most successful civilization the world has ever seen. i think its capital city had the largest population of any city in all of world history. its military probably never lost a single battle, and i bet it conquered nearly all of europe, asia, and africa. i've heard a report that said one in every three books found in american libraries today was first written by the ancient greeks!
a. the information is out of date because it was published in 2012. b. the information presented is off-topic and unrelated to ancient greece. c. the author does not cite any reliable sources to support his claims.
d. the author does not include his last name along with the article.