If an Activity's Cost Is Plotted Against Its Duration on Axes

Multiple Choice

If an activity's cost is plotted against its duration on axes with zeros at the origin:

A) the slope of the line is positive because it costs more to finish an activity more quickly.
B) the slope of the line is negative because a shorter activity costs less than a longer one.
C) the slope of the line is negative because it costs more to finish an activity more quickly.
D) the slope of the line is positive because a longer activity costs more than a shorter one.