Summary by any other name
Answer:
Spaceship! I love these puzzles
I believe it's (2), as high school bake sale already states that there will be sweet treats sold :)
I'd probably go with the first one because the second one, lifting and stretching arms helps with breathing, the third, taking a run is considered a cool-down exercise and the last one is stretching legs, stretching muscles is advised after a workout. Which leaves me to believe that the answer is the first one.