35 POINTS FOR ONE QUESTION!!!!!!!!!!!!!!!!!!!!!!!!!!

Which of the following is the term for an increase in population in cities?
a. urbanization
b. rural displacement
c. urban mobility
d. population redistribution

I think it is either urbanization or population redistribution. It could be urbanization because that means to make an area more urban, or city-like. It could be population redistribution because people up and moved to a new location to find more work. Can someone please help me?