Jeremy works on a construction site operating a jackhammer and a large welding machine. Jeremy is frequently exposed to sounds with high decibel levels due to being around these machines so often. Jeremy's brother, Alexander, on the other hand works in a library. Unlike Jeremy, Alexander is frequently exposed to sounds with very low decibel levels during his work. Whose ears, Jeremy's or Alexander's, are more at risk of being damaged due to the sounds they encounter frequently?
A:
Jeremy's