The best and most correct answer among the choices provided by the question is the third choice "natural monopolies"
Natural monopolies<span> arise where the largest supplier in an industry, often the first supplier in a market, has an overwhelming cost advantage over other actual or potential competitors; this tends to be the case in industries where fixed costs predominate.</span>
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The White Paper policy was written in 1939
The beginning of 1917 was a very turbulent period during the follow of events of the WWI. Germany announced in January, it would engage against any Allied shipping using its submarine force. In February of that same year the president Wilson told the Congress that the US had broken diplomatic relations with the German government.
In march of that year Germany sank five US vessels, contributing to the already unstable American society. The british propaganda in the US and the deep economical involvement with the Allies carried the country to finally enter the War.
The correct answer is c) Question assumptions.
Explanation: the main idea of the "Question Assumptions Technique" is to identify every assumption that has already been made and reconsider if they are really true or not in order to find a solution to a problem.
