Final answer:
The justification that the quote "We need new markets and raw materials; trade is the solution to our problems" most relates to is B. Commercial Necessity, reflecting the economic imperatives driving imperialism and the continuity of mercantile practices.
Step-by-step explanation:
The quote "We need new markets and raw materials; trade is the solution to our problems" most closely relates to the concept of Commercial Necessity. This justification was rooted in the belief that in order to maintain economic strength and prevent domestic crises, such as declines in wages and unsold products, a nation needed to constantly seek out new markets and sources of raw materials. In history, industrialists and policy-makers advocated for imperialism under the guise of this necessity, arguing that it was essential for the nation's economic well-being. Such imperialistic ventures were often rationalized with the intent of spreading democracy and freedom, yet they mainly aimed to secure economic interests and markets for home-made products, reflecting a continuation of mercantilist practices where colonies were sources of raw materials and markets for the industrializing nations.