The brain and spinal cord are enclosed by three layers of membranes from outer to inne
A.the dura mater,the arachnoid,the pia mater
B.the dura mater,the pia mater,the arachnoid
C.the pia mater,the arachnoid,the dura mater
D.the pia mater,the dura mater,the arachnoid
E.the arachnoid,the pia mater,the dura mater