Answer:
B) Nations that considered themselves superior felt obliged to govern less-advanced nations.
Step-by-step explanation:
The Social-Darwinism theory is about the survival of the fittest, about most powerful species conquering the least powerful.
In the context of this question, it is about more powerful nations taking control of the less powerful.
So the correct answer is:
B) Nations that considered themselves superior felt obliged to govern less-advanced nations.