Answer:
The correct answer is letter "A": they are produced using scarce resources.
Step-by-step explanation:
Scarcity is the basic economic problem by which people have unlimited needs but rely on limited resources to fulfill them. Scarcity pushes individuals and organizations to allocate their resources efficiently to maximize their benefits. Trade-offs are the results of scarcity since people must give up on the satisfaction of part of some of their needs so others can be fulfilled.