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Examples of magnetic materials are:

A. Iron, Nickel, and Cobalt
B. Gold, Aluminum, and Copper
C. Earth
D. All of these
Correct Answer: A. Iron, Nickel, and Cobalt

Iron, Nickel, and Cobalt are ferromagnetic materials, meaning they are strongly attracted to magnets. Gold, Aluminum, and Copper are non-magnetic, and Earth is a source of magnetism, not a material itself.

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