A. If the expansion of the Universe has always been constant (neither speeding up nor slowing down), then the age of the Universe is 1/Ho, which equals to. B. Hubble's constant does not change with time. C. Ho is the constant of inverse proportionality between the observed recession speeds (v) and distances (d) of galaxies.→ (You ruled this out) D. Hubble's constant is believed to be constant throughout all of time and the entire Universe. E. The value of Hubble's constant is best determined with the very nearest galaxies, whose distances can be measured accurately. → (You ruled this out)