I believe that the answer most befitting the question would be answer D.
Well the meaning of an adjective phrase is: group of words that describe a noun or a pronoun in any type of sentence.
So it's B. Because it's collective 'Boxes' as we know and an adjective phrase is a group of words that describe a noun or a pronoun.
Hope this helps :)<span />
I believe it is D, He relied heavily on science :) I hope this helps!
