[单选题]
10.05: When computed with proper MKS units, the Universal Gajtzciqw7.n -zg z/7-js )xz --; gtvddwConstant divided by Boltzmann’s constant is eqtxwd gv)d--z;ual to
A. the speed of light.
B. Planck’s constant.
C. Avogadro’s number.
D. the permittivity of free space
E. the Universal Gravitational constant.