Below are listed the atomic weight, density and lattice parameter for two hypothetical alloys. For ach determine whether its crystal structure is FCC$,$ BCC$,$ SC $($Simple Cubic$)$ and then justify your determination.

$\backslash$table$[[$Alloy$,$Atomic mass $($g$/$mol$),$Density $($g$/$cm $3^3),$Atomic Radius $($nm$)],[$A$,77,4,10,69,0,125],[$B$,107,6,9,49,0,133],[$C$,127,3,13,05,0,142]]$