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by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.