When Tim stepped onto the deserted campsite, the campfire was a mere glow of coals. The picnic table sat in disarray, covered by
melted marshmallows and chocolate, empty drink cans, and half-eaten hot dogs. The sounds of water splashing and laughter echoed in the distance; Tim's friends had gone for a late-night swim. Tim could see flashlight beams bouncing on the water's surface. I guess I'll have to be the "grown-up," he muttered to himself. With an abrupt snap, Tim opened the garbage bag and began cleaning up after his friends. Which descriptive phrase from the scenario best represents lightheartedness?
From these options you added on the comment section (<em>A. Deserted campsite / B. A mere glow of coals / C. Flashlight beams bouncing / D. Empty drink cans</em>), the descriptive phrase from the scenario that best represents lightheartedness is <u>C: Flashlight beams bouncing</u>.
This phrase shows movement and fun, the action is referred to what Tim's friends are doing; having a great time, being joyful and cheerful, enjoying the moment in the water.
This means the line "The sounds of water splashing and laughter echoed in the distance; Tim's friend's had gone for a late-night swim." is the phrase that is the correct answer, since it talks about the happy actions of Tim's friends.
proofreading and editing are for changing bigger aspects like sentence structure and organisation, you should change your spelling errors as they come up in the first draft