The correct answer is A. 25413.
The first option, “own”, is the subject of the sentence. The second option, “virtue”, is the object of the preposition “of”. The third option, “its”, is the possessive pronoun that refers to “virtue”. The fourth option, “reward”, is the direct object of the verb “has”. The fifth option, “has”, is the verb of the sentence.
The sentence can be rewritten as “Virtue has its own reward”. This means that doing good things will eventually lead to good things happening to you.
Option B, 25314, is incorrect because the object of the preposition “of” comes before the preposition. Option C, 25341, is incorrect because the possessive pronoun comes before the noun it refers to. Option D, 25143, is incorrect because the direct object comes before the verb.