To critique NAFTA by selecting the type of factor that most contributed to international stability, the most appropriate choice is:
B) economic factors
NAFTA aimed to eliminate tariffs and promote free trade among the three countries, which facilitated economic integration and interdependence. By enhancing economic cooperation and reducing trade barriers, NAFTA contributed to stability in the region through increased economic growth, job creation, and the strengthening of economic ties, which can lead to better diplomatic relations and overall stability. While other factors, such as diplomatic engagement, are also important, the core of NAFTA's contribution to stability is rooted in its economic impacts.