Please choose the correct ending to complete the given sentence: Doing karate: A boy wearing white shorts is standing in a room. he

Ending1: starts playing on a dark wooden set of drums. Ending2: then begins playing a squash game while standing on two stilts. Ending3: is playing a piano as he adjusts his headphones. Ending4: puts something in his mouth.

Answer format: ending1/ending2/ending3/ending4