A College Student Has a New Job,and Must Balance Classes

A college student has a new job,and must balance classes and commute times to work.The student takes two weeks to drive from campus to the workplace by several routes,including a direct route through town,a highway route,and a route through a city park.Comparing the drive times,affected by the route,speed limits and intersections is possible.The dependent variable is the

A) total amount of time spent stopped at stop signs and stoplights at intersections.
B) average time in minutes it takes to drive from campus to workplace.
C) the time in minutes after class lets out, until the student has entered traffic to drive to the workplace.
D) distance in miles of each possible driving route from campus to workplace.