Answer:
The correct answer is letter "B": resources are limited and therefore cannot satisfy one's many competing wants.
Step-by-step explanation:
Scarcity is the main problem in economic by which people have unlimited needs but finite resources to satisfy them. As a result, individuals must make tradeoffs to sacrifice part of the satisfaction of a need, to satisfy part of another need. Scarcity pushes people to make rational decisions to maximize their returns.