Final answer:
The most likely cause of Rodrick's hearing problems is damage to his Eardrums due to repeated exposure to loud sounds.
Step-by-step explanation:
The most likely cause of Rodrick's hearing problems is damage to his Eardrums. Repeated exposure to loud sounds, such as playing the drums in a band, can lead to damage to the tiny hair cells lining the cochlea in the inner ear. These hair cells are responsible for detecting sound waves and sending nerve impulses to the brain for interpretation.