Final answer:
Ariel's sisters do not make a specific promise to King Triton regarding Ariel in 'The Little Mermaid'; thus, the multiple-choice options do not reflect an event in the movie.
Step-by-step explanation:
In the Disney movie "The Little Mermaid," Ariel's sisters do not specifically make a promise to King Triton regarding Ariel's actions or whereabouts. The plot revolves around Ariel, the youngest daughter of King Triton, and her desire to live in the human world after falling in love with Prince Eric. King Triton does become concerned about Ariel and at one point enlists the help of Sebastian, the crab, to look after her. However, Ariel's sisters are not tasked with making any promises about bringing Ariel back or capturing her. Therefore, the choices provided do not accurately represent a specific promise made by Ariel's sisters in the film.