Scarcity always exists because À)machines and people are inefficient.

B)changes have occurred in global weather patterns.

C) our needs and wants are not limited, but our resources are limited.

D)there are more poor people than rich people

C.

Explanation:

Scarcity is considered an economic problem where wants exceed the limited resources. Scarcity is a gap between scarce resources and unlimited wants. It is also known as 'paucity.'

This phenomenon of scarce resources and unlimited wants always exists in the form of scarcity. Therefore, option C is correct.

a drastic rise in oil prices ended decades of postwar.