Final answer:
Aphrodite acts first by saving Paris (option b)in the story related to the Trojan War, preventing Menelaus from killing him.
Step-by-step explanation:
The subject of the question seems to be related to a literary work, likely from the Greek mythology surrounding the Trojan War. Given the characters mentioned, such as Aphrodite, Paris, and Menelaus, it is probable that the question is referring to an episode from Homer's Iliad or a related mythological text. In the literature, Aphrodite acts first by saving Paris from being killed by Menelaus during their duel.
Therefore, the correct answer would be that Aphrodite acts first, and her intervention has the effect of saving Paris's life, which in turn prolongs the Trojan War.