10% tin can be added to copper in the molten state and cooled to give a substitutional solid solution known as bronze. This means that the crystal structure of the solid solution: a) consists of unit cells of FCC copper interspersed with unit cells of FCC tin b) is basically that of FCC copper with some of the copper atoms replaced by tin atoms. c)is that of tin with copper atoms squeezed in the gaps d) is that of copper with the tin atoms squeezed into the spaces between the copper atoms e) None of the above