If you see a large group of stranded passengers standing next to a disabled bus, and you have only three seats in your car, deciding who to rescue deals with the issue of:
a) efficiency
b) equity
c) scarcity
d) macroeconomics
It all depends for B) you can say equity because it deals with the quality of being fair but C) also means. The state of being scared or short in storage . My option I would choose B because it represents more towards the question