Using standard alphabetical filing rules, which name is filed first: Joy Delos Reyes, Joy Dela Cruz, Joy Del Prado, Joy De Vera?

Correct answer: B. Joy Dela Cruz

Indexed surname first, the filing order is DELA CRUZ, Joy → DELOS REYES, Joy → DEL PRADO, Joy → DE VERA, Joy. The name filed first is Joy Dela Cruz. Joined prefixes give delosreyes, delacruz, delprado and devera. Comparing letter by letter, "dela" comes before "delo" and "delp", and "dev" comes after all of them.