B. A long period of relative peace in the empire
The Roman Empire flourished well during the Pax Romana!
The correct answer to this open question is the following.
Although it is hard to understand what the question is asking by the way it is stated, we can say that President Franklin D. Roosevelt was very aware of the problems and hardships of rural America that lacked electricity. That is why, as part of his "New Deal," he established the Rural Electrification Authority to solve this problem. This helped farmers to get loans and created electric cooperatives. These loans were low cost and created many jobs too. The Rural Electrification Act was passed on May 20, 1936.
Because western democracies wanted to avoid war at all costs, wanted peace, hoped that a strong Germany would stop growth of communist Russia, wanted to avoid foreign affairs or felt it was not their business.
Out of the choices given, the one that was NOT a contributing factor to the fall of the Roman Empire was the decline in trade. The correct answer is D, decline in trade.