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?