Whats the question so I can answer it
The answer is <em>D. Mercutio believes Romeo would lose in a fight against Tybalt.</em>
A clause is a group of words that contain a subject (the noun or pronoun about which something is being said, usually the doer of the action) and a verb (a doing word). An example of a clause is: The fast, red squirrel darted up a tree. The subject of this clause is the fast, red squirrel and the verb is 'darted'.