[单选题]
A spherical mirror on which +,oifu,s:fx r82( a/qip ym ulreflem.qpn:u-6by uf i s:0oction takes place on the inner surface of the sphere is referred to as amnuupyf 6q .ob:-:0si
A. convex mirror.
B. concave mirror.
C. plane mirror.
D. double-sided mirror.
