The statement that best investigates the relationship between Social Darwinism and New Imperialism is:
D. Social Darwinism portrayed white Europeans as culturally superior to other races and was used to justify the colonization of the other nations.
This statement accurately reflects how Social Darwinism was employed during the era of New Imperialism to rationalize the expansion and domination of European powers over other regions and peoples, emphasizing notions of racial superiority and the supposed natural right of stronger nations to conquer weaker ones.