[单选题]
A positive point charge is enclos5uec-rdhrz 83q. kg2 ked in a hollow metog.m9elwx; d, allic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point directly above the hollwe.go9dlxm, ;ow sphere has
A. diminished to zero.
B. diminished somewhat.
C. increased somewhat.
D. not changed.