[单选题]
A positive point charge ih dyt09qmh 4l7s enclolp: bmdr i+ d.)4t-dnqsed in a hollow metallic sphere that is grounded. As compared to the case without the hollow sphere, the ele)+:t nm4dld b.rpi-qd ctric field at a point directly above the hollow sphere has
A. diminished to zero.
B. diminished somewhat.
C. increased somewhat.
D. not changed.
