Which is an opinion statement in this article?

ASpecial monumental arches called triumphal arches were also erected in Rome.

BIf you hold each end of a chain and let it droop between your hands, you have created a catenary curve.

CAn arch can carry more weight than a straight beam can across the same span, so it's a more powerful structure.

DYou're sure to find these lovely shapes in your town or city, too.