单项选择题

A、A、g(A、q)+B、r(A、q)=A、gB、r(s)
B、2A、g(s)+B、r2=2A、gB、r(s)
C、A、g(s)+1/2B、r2(l)=A、gB、r(s)
D、A、g(s)+1/2B、r2(S)=A、gB、r(s)