Final answer:
Sheldon teaches Henry how to play the saxophone.
Step-by-step explanation:
In the given options, Sheldon teaches Henry how to play the saxophone. This is indicated by option c. Teaching someone how to play a musical instrument involves providing guidance, instruction, and practice exercises to help them develop their skills and understanding of the instrument.
Sheldon would likely demonstrate proper technique, explain how to read sheet music, and give Henry exercises to practice fingering and playing different notes on the saxophone.