Pat can either drive to work, which takes half an hour and uses $1.50 worth of gas, or take the bus, which takes an hour and costs $1.00. How should Pat get to work?

A、Pat should drive because it saves half an hour relative to taking the bus.;
B、Pat should drive if saving half an hour is worth $0.50 or more.;
C、Pat should take the bus if saving half an hour is worth $0.50 or more.;
D、Pat should take the bus because it costs $0.50 less than driving.