The answer is A. <span>Because I spent three hours on my homework.
This fragment provides a verb statement, but there is no subject preceding this statement. A sentence must have a subject-verb agreement to be considered a sentence. Without one or the other, it is a sentence fragment.
</span>
A participle is a word formed from a verb.
Like going, gone, being, or been.
It can also be an adjective like working woman, burned toast. (A verb being used as an adjective).