What might happen if a person’s ear canal was blocked?

A. Sounds would be louder.
B. Sound waves would vibrate longer.
C. Sound waves would travel longer.
D. Sounds would be harder to hear.

D. Sounds would be harder to hear.

Explanation:

if the ear canal is blocked then the sound waves cannot reach the ear drum thus we cannot hear clearly.

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i think its c if i'm wrong