The relevance of both logics, namely selfsufficiency and internal fragility, to isolationism can be clearly seen in the example of the United States foreign policy (Johnstone, 2011, 7-20). Since its establishment in the late 18th century till the beginning of the 20th century, the United States pursued an isolationist foreign policy. During this era, the United States had been weaker than many European colonial powers and the latter had geopolitical designs in the American continent. The correct answer is B.