Which of the Following Situations Will Create Diversity Jurisdiction

Which of the following situations will create diversity jurisdiction?

A) New York sues Virginia to stop the sale of firearms to New York residents.
B) April, a Delaware resident, is a student at the state university in Delaware and sues for $1 million after she was molested on campus due to lack of appropriate security.
C) April, a Delaware resident, is a student at an out-of-state university and sues the school for a $50,000 tuition refund when she must leave for a semester for a personal family emergency and the school refuses a refund or credit.
D) April, a Delaware resident, sues Mike, a New York resident driving in Delaware, for $80,000 when he rear-ends her while she's riding her bicycle and severely injures her.