Given the following information, what is the beta of the portfolio comprised of stocks $A,B,$ and $C,$ assuming the stocks are priced in equilibrium?

$\backslash$table$[[$Stock$,E(Rs)=Rs,\backslash$table$[[$Dollar$],[$Investment$]]],[$A$,0\mathrm{.}2,100],[$B$,0\mathrm{.}12,200],[$C$,0\mathrm{.}15,500],[$Rf$,0\mathrm{.}04,],[$Rm$-$Rf$,0\mathrm{.}08,3]]$

Select one:

a$.1\mathrm{.}36$

b$.1\mathrm{.}78$

c$.1\mathrm{.}52$

d$.1\mathrm{.}16$