Question

Pepole make choices about how to use__ resources.

Answer 1

People make choices about how to use insufficient resources.
Insufficient means that there aren't enough.
We need to make proper choices about using resources properly.
There aren't that many left....

Answer 2

The correct answer is: "scarce".

The scarcity of resources is the base of the economic science. Economic agents decide about how scarce resources are allocated to produce good and services directed to satisfy human needs which are theoretically limitless. Scarcity involves tradeoffs, giving something up to be able to obtain the scarce resource that is wanted.