Ceramic compounds AB and AC both have the zinc blende crystal structure and are soluble in one another at all concentrations. Determine the concentration in weight percent of AC that must be added to AB to yield a unit cell edge length of $0\mathrm{.}5304$ nm$.$ The densities of AB and AC are $4\mathrm{.}8$ g$/$cm$3$ and $4\mathrm{.}2$ g$/$cm$3,$ respectively. The atomic weights of A$,$ B$,$ and C are $30,80,$ and $60$ g$/$mol$,$respectively$.$

a$.38$

b$.26$

c$.32$

d$.41$

e$.21$

f$.15$

g$.45$