Answer:
B that was my favorite color
Explanation:
becasue a clause is a elative pronouns who*, that, which, whose, where, when. They are most often used to define or identify the noun that precedes them. and to find a clause you have to look for a sentence with a subject and a verd and it will always have a relative pronoun (who, whom, whose, that or which) or a relative abverb like ( when, where or why) Finally, it will function as an adjective, answering the questions What kind? How many? or Which one?
