Final answer:
Aphrodite favored the Trojans because Paris, son of the King of Troy, awarded her the golden apple as the fairest goddess in exchange for the love of Helen of Troy, as recounted prior to the Trojan War.
Step-by-step explanation:
One possible explanation for why Aphrodite favoured the Trojans in the Trojan War, according to Mythology Unbound, relates to a mythical event that preceded the war. This event was a beauty contest between the goddesses Juno, Minerva, and Venus (Aphrodite).
Paris, the son of the King of Troy and a shepherd at the time, was chosen to judge this contest. Aphrodite promised Paris the love of the most beautiful woman in the world, Helen of Troy, if he chose her as the fairest. Paris accepted the offer and awarded the golden apple to Aphrodite.
This act aligned Aphrodite with the Trojans in the ensuing conflict, as she sought to uphold her part of the bargain with Paris.