Which of the following sentences contains a capitalization error?

a.
mr. jo, who was working in his field that morning, said, "the alien spaceship appeared right before my own two eyes."

b.
our coach motivated us to stay positive. he said, “winning is not something, it is everything.”

c.
freud states, "a dream is the fulfillment of a wish."

d.
according to some, dreams express "profound aspects of personality."

The correct answer is B. Our Coach motivated us to stay positive. He said, “Winning is not something, it is everything.”

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.