The statement that best investigates the relationship between social Darwinism and New Imperialism is:
"Social Darwinism portrayed White Europeans as culturally superior to other races and was used to justify the colonization of other nations."
This response accurately reflects how social Darwinism was often utilized to rationalize the imperialist attitudes and actions of European powers during the era of New Imperialism, promoting the idea of European superiority and the legitimacy of colonization.