Hubble's constant is about 22 km/s/million light-years, implying an age of about 14 billion years for the universe. If Hubble's constant were 11 km/s/million light-years, the age of the universe would be about _______.
a) Impossible to say, because Hubble's constant has no relationship to the age of the universe.
b) 28 billion years
c) 7 billion years
d)14 billion years