Non metal i believe let me know if i helped
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Wat is considered a compound of hydrogen and oxygen and not a mixture because hydrogen and oxygen have gone through a chemical process to form the compound h2O. A mixture can generally be easily separated whereas a compound must undergo another chemical process to separate its elements. Therefore to separate oxygen and hydrogen from water a chemical process is necessary.
Conduction is particle to particle. Convection is by molecular motion. Radiation is energy that is transmitted in the form of rays or waves. C seems like the best answer.