Final answer:
The focus of increasing the total amount of available productive resources is supply-side policy.
Step-by-step explanation:
The focus of increasing the total amount of available productive resources is c) Supply-side policy.
Supply-side policy refers to government policies that aim to stimulate economic growth and increase the production capacity of the economy. It focuses on promoting investment, innovation, and entrepreneurship to improve the supply side of the economy and increase the availability of productive resources.