Final answer:
The correct answer is Globalization and interconnectedness, which are key drivers supporting the growth of international trade. They have led to a decline in trade barriers and technological advancements in transport and communications, culminating in more efficient and widespread trade. Therefore, the correct option is D.
Step-by-step explanation:
The four ongoing forces supporting the growth of international trade are not inclusive of political isolationism, technological regression, or trade barriers and protectionism. Rather, the correct answer is D. Globalization and interconnectedness, which have served as a catalyst for expanding international trade. This phenomenon relates to the integration of markets, policies, and advancements in technology that together have made cross-border exchange more efficient and accessible. The reduction in government-imposed trade restrictions, such as tariffs and quotas, alongside technological improvements in transportation and communications, have played a significant role. These advancements have not only made people more aware of global offerings but have also led to an increase in competition, which can potentially result in better and more affordable products for consumers worldwide. As a result, although there can be drawbacks such as negative impacts on certain businesses and jobs within domestic markets, the overall global economy tends to benefit from the proliferation of international trade nurtured by globalization.