[单选题]
A positive point charge is enclosed in a hollow metalljn 59 x,kyd3yric sphere that is grku69+vtt guy7ounded. As compared to th6uvu7tk+ tg 9ye case without the hollow sphere, the electric field at a point directly above the hollow sphere has
A. diminished to zero.
B. diminished somewhat.
C. increased somewhat.
D. not changed.
