I believe the answer is Are the main factor in... hope this helps
What does he mean even tho this isnt an answer
An adjectival phrase or adjective phrase consists of a group of words that describes a noun or a pronoun. In the given sentence, the adjective phrase is, option C. Those old. The noun it describes is, "Patio Chairs".
I think it's d because to me that's the only one that makes sense out of all of them.
