I am stuck on this question. Would it be state?

Mary and Hanna, who are Tennessee residents, were traveling through Mississippi when they were involved in an automobile accident with Franco, who is a resident of Mississippi. Franco sues Mary, who was driving the car, in federal court in Mississippi and asks for $100,000 to reimburse him for his medical bills and lost wages. In deciding the case, what law will the federal district judge apply? federal law state law O U.S. Supreme Court case law either state law or federal law