The correct answer is B. Our Coach motivated us to stay positive. He said, “Winning is not something, it is everything.”
Step-by-step explanation:
According to grammar, proper nouns should be capitalized this includes the names of people, specific companies, brands, institutions or places, names of historical events, among others. Additionally, titles such as judge, doctor or president are capitalized only in the case they are placed before the proper name of a person. This implies in the case of the sentence "Our Coach motivated us to stay positive. He said, “Winning is not something, it is everything.” capitalizing the word "coach" is not correct and therefore this sentence contains a capitalization error.