In the context of "The Hunger Games," Katniss explains the use of the berries during the interview by choosing option a) "She describes them as a symbol of her love for Peeta."
Katniss and Peeta's use of the berries, known as nightlock, was a dramatic and strategic move during the Games. By threatening to eat the poisonous berries together, they were attempting to defy the Capitol's rules and force a situation where either both of them would die or the Capitol would have to allow two victors from the same district. This act was a powerful symbol of their love and defiance, and it played a significant role in the story's narrative.