Answer: B) Brian.
Explanation: a noun is a word (other than a pronoun) used to identify any of a class of people, places, or things (common noun), or to name a particular one of these (proper noun). From the given options, the word that represents the proper noun found in the given sentence, is the corresponding to option B: Brian. It is a proper noun because it is naming a particular thing, in this case, a particular person.
