Question: What plot follows Barden University's all-girl a cappella group, The Barden Bellas, as they compete against another a cappella group from their college to win Nationals, and starred an actress known for her role of Alexis in the party film "Project X"?
Sentence (from "Alexis Knapp"): Alexis Merizalde Knapp (born July 31, 1989) is an American actress and singer.
Relevant evidence: No