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Material $X$ and Material $Y$ both become magnetic when they are placed in an external magnetic field. When the external field is removed, Material $X$ is no longer magnetic while Material $Y$ retains its magnetic properties.

Which statement below best describes these materials?

A

Material $X$ is ferromagnetic; and Material $Y$ is paramagnetic.

B

Material $X$ is paramagnetic; and Material $Y$ is ferromagnetic.

C

Material $X$ is diamagnetic; and Material $Y$ is paramagnetic.

D

Material $X$ is ferromagnetic; and Material $Y$ is diamagnetic.

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