Which is not a merit of cooperative federalism?
federal cooperation mitigate the problem of collective action among states.
federal assistance encourages state and local governments to generate positive externalities.
cooperative federalism respects the traditional jurisdictional boundaries between states and federal government.
federal assistance ensures some degree of uniformity of public services across states.

Federal cooperation helps mitigate the problem of collective action among states.

Explanation:

Cooperative federalism implies that both the federal government and the provincial governments collaborate sustainably, each in their area of competence, sharing their respective powers and resources for the realization of certain purposes.

The regime of distribution of competencies is not discussed; Everyone keeps their own.

Two types of cooperation can be distinguished: Federation-states, in which each, within their respective competences, carries out joint projects. Horizontal cooperation occurs exclusively between states without intervention of the Federation.

the answer is b, encourage free trade