What defines a reaction shot in film?

A reaction shot is specifically characterized by its focus on an individual's emotional response, typically portrayed through a close-up of their face. This type of shot is crucial in conveying the characters' feelings, enabling the audience to connect with their emotional states in relation to the events or dialogue occurring on screen. By zooming in on the facial expressions, filmmakers can emphasize the significance of a moment, showcasing how one character's expression can speak volumes about their reaction to another's actions.

The other options do not align with the definition of a reaction shot. Capturing multiple characters' actions overlooks the individual focus that defines reaction shots. A long shot of a setting fails to convey personal reactions, concentrating instead on the environment. A stationary view of a scene misses the dynamic emotional exchange that a reaction shot aims to highlight. Thus, the correct answer underscores the essence of how individual reactions are presented visually in film.