Matthew Stafford and Kelly Stafford just put their 4th-grade knowledge to the test, and it didn’t turn out well for Kelly. She clearly struggled to answer the trivia from first to fifth grade, which she had no idea about. “Here’s a fourth-grade English question,” Guest from NF Elementary Mary Crippen asked the couple. “Which type of figurative language is used in this sentence? The stadium roared with excitement after Matthew threw the winning t…