Using standard alphabetical filing rules, which name is filed second: Ben dela Rosa, Ben De Jesus, Ben Del Mundo, Ben De Castro?

The correct answer is B. Ben De Jesus

Indexed surname first, the filing order is DE CASTRO, Ben → DE JESUS, Ben → DELA ROSA, Ben → DEL MUNDO, Ben. The name filed second is Ben De Jesus. Prefixes join the surname: decastro, dejesus, delarosa, delmundo. Comparing letter by letter, "dec" comes before "dej", which comes before "del".