The correct answer is: A. Compounds
An alloy is a mixture of two or more metals, or a metal and a non-metal, that has metallic properties. Alloys are typically harder and stronger than the pure metals from which they are made.
A compound is a substance that is made up of two or more elements that are chemically combined. The elements in a compound are held
together by chemical bonds, which are much stronger than the physical forces that hold together the particles in a mixture.A mixture is a substance that is made up of two or more substances that are not chemically combined. The substances in a mixture can be elements, compounds, or other mixtures. The substances in a mixture are not held together by chemical bonds, and they can be separated by physical means, such as
filtration or distillation.A solution is a special type of mixture in which the solute (the substance that is dissolved) is evenly distributed throughout the solvent (the substance that does the dissolving). Solutions are homogeneous systems, which means that they have the same composition throughout.
In conclusion, alloys are not compounds because they are mixtures of metals, not chemically combined elements.