What role does opportunity cost play in decision making

Which three parts of these excerpts reflect the idea that war affects not only the minds of the combatants but also their physical reactions?

Which best describes the suspense technique of flashback? an image, color, object, or similar is shown early in the film. it later reappears in a pivotal scene or plot point. details of the story outside of the chronological storyline are provided to the audience, often as a memory. illusions of explosions and other events are presented, often using computer-generated imagery to seem realistic. the screenwriter lets the audience know something the main character does not, usually something important to the plot.

While studying, lana reached her goal of reading half a chapter without interruptions. what should she do next?