Uma just broke up with her long-time boyfriend and is very upset. To deal with the stress of losing her love, she tries to think about the good things that came from the relationship (like learning to surf and all the traveling they did) instead of the negatives (all the fighting and heart ache). Uma is most clearly engaging in .

Uma is most clearly engaging in cognitive reappraisal .

Explanation:

Cognitive reappraisal is a psychological strategy that is useful when the stressful situation at hand cannot be changed. It involves lessening the emotional impact of a stressful situation by reframing or reappraising the initial perception of it.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.