The Petrified Forest, visited by me four years ago, is now my favorite national park.
1. Which best describes the underlined phrase?
A nonessential past participial phrase
B essential present participial phrase
C essential past participial phrase
D nonessential perfect participial phrase
Past because it says four years ago and stated "visited", also nonessential because if you removed it from the sentence it changes nothing of substance, it's enclosed between two commas.
