In Cosmology, the Constant That Is Intimately Related to the Present

Multiple Choice

In cosmology, the constant that is intimately related to the present "age" of the universe is

A) the constant in Wien's law of radiation.
B) 1/G, the inverse of the universal gravitational constant.
C) the Planck time, 10^-43 s, in which space and time came into existence.
D) 1/H₀, the inverse of the Hubble constant of expansion.