Final answer:
Medicaid is an illustration of cooperative federalism, as it involves joint funding and administration between federal and state governments to provide healthcare to those in need. The correct ption is option D.
Step-by-step explanation:
Cooperative federalism is best described as a system where national, state, and local governments interact cooperatively to solve common problems, rather than making policies separately. A clear illustration of cooperative federalism from the options provided is Medicaid. This program is jointly funded by the federal and state governments but administered at the state level, providing healthcare to low-income individuals and families. This cooperation of different government levels allows for resources to be pooled together, and creates uniformity in public services while respecting jurisdictional boundaries.