[单选题]
If the voltage across a circuit of const ez9+oe ep,v6jant resistance is dojc p7/g+9sectaicdfrw0 1 g73ubled, the power dissipated by thatawg9cd 7s0 p1r3je7c cg/+ fit circuit will
A. quadruple.
B. double.
C. decrease to one half.
D. decrease to one fourth.
