The average fare for big city public

The average fare for big city public transportation involving millions of people moving to and from their workplaces every weekday has generally increased more slowly than inflation has.

a)transportation involving millions of people moving to and from their workplaces every weekday has generally increased more slowly than inflation has.
b)transportation involving millions of people moving to and from their workplaces every weekday have generally increased more slowly than inflation.
c)transportation, during which millions of people moving to and from their workplaces every weekday, has generally increased more slowly than inflation.
d)transportation, where millions of people are moved to and from their workplaces every weekday, have generally increased more slowly than inflation.
e)transportation, where millions of people are moved to and from their workplaces every weekday, has generally increased more slowly than has inflation.