Olease sopve it..

Let nos in aap are a, ar (=b),ar^2(=c), ar^3(=d) So (b+c)^2= (ar+ar^2)^2= (ar)^2(1+r)^2...(i) Now (a+b)*(c+d)= (a+ar)*(ar^2+ar^3)= a(1+r)*ar^2(1+r)= (ar)^2*(1+r)^2 ...(ii). So from (i)&(ii) 3rd option is correct