A.0 B.1 C.A! D.A
A.y=a*b*c B.y=a+(b)!*(c)! C.y=a+(b)!+(c)! D.y=a+b*c
A.(a*b*a*c)! B.((a*b)!*(a*c)!)! C.((a+b)*(a+c))! D.((a*b*c)!)!