[单选题]
The reason ocean temperatures do not vary drasticalg qhw1r(y di;+ly isn02 1mi(*j ywu* vfzf,v(wn f,xyk*fp that
A. water has a relatively high rate of heat conduction.
B. water is a good radiator.
C. water has a relatively high specific heat.
D. water is a poor heat conductor.
