The question is asking "Which of the following sentences has an error in capitalization? A. The cruise ship crossed the Atlantic Ocean during very calm seas - here, the capitalisation is correct, Atlantic Ocean is a proper name. B. He looked at me carefully and stated, "Don't worry because I'm here. - this is the correct answer. Since the sentence in the quote is a part of the whole phrase grammatically, there is no need to capitalize it. C. Central Park is one of New York's features I would love to visit someday. - here all the capitalized words are proper names, so it's correct! D. Maybe you've already heard the news: Jamie and Alex are going to have a baby! - Jamie and Alex are proper names, so they capitalisation is correct