Name two national U.S. holidays.

The correct answer includes New Year's Day and Martin Luther King, Jr. Day, both of which are recognized as national holidays in the United States. New Year's Day, celebrated on January 1st, marks the beginning of a new year and is widely observed across the country. Martin Luther King, Jr. Day, observed on the third Monday of January, honors the civil rights leader and his contributions to the American civil rights movement. This day is a federal holiday, emphasizing the importance of equity, justice, and community service.

The other options include holidays that are not recognized as national federal holidays or mix federal holidays with those that are more culturally or regionally celebrated, such as Valentine's Day, which is not a federal holiday.