Which was used to justify european imperialism in the late nineteenth century? a. a new wave of nationalism. b. creation of a social utopia. c. democratic reform. d. the philosophy of karl marx

The correct option is:  

A. A new wave of nationalism.

Throughout the 19th-century, a strong nationalist sentiment was used to justify the imperialism that directly contributed to major changes through their promotion of racism and competition between the nation-states that had arisen. In the Age of Imperialism, European industrializing nations got involved in the process of colonizing other parts of the world.  

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nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know