Answer:
c. is a problem that exists in every economy.
Step-by-step explanation:
Scarcity is shortage of supply with respect to demand.
This arises because of (causes) : Unlimited Wants, Limited resources having alternative uses.
Scarcity is a problem of each & every economy : underdeveloped, developing or developed economy. Eg - Developed Economy like US might be labour scarce, capital abundant & Developing Economy like India might be capital scarce, labour abundant.
This leads to (effects) : 3 Central Problems of Economy - What to produce , How to produce , For Whom to Produce .