单项选择题

A.Sp(FSZ)=Scp/OUF=Scp/Sc
B.Sp(FSZ)=OUF/Scp=Sc/Scp
C.Sc=Scp/OUF=Scp/Sp
D.Sc=OUF/Scp=Sp/Scp
E.OUF=(Sc+Sp)/Scp