Among several definitions mentioned in the text and the article "Progress through Racial...," this definition of eugenics was argued the most during the conflicts of World War I:

a) a British approach to warfare in which higher races will exterminate other higher races to find out the legitimacy of the 'surviving' culture, its strength, and its civilizational legacy.
b) a momentum of civilization depended on the extermination of the higher races by the lower races in order to carry on the values diversity.
c) a key to progress was the annihilation of the lower races who stood in the way of advanced culture and civilization.
d) none of the above.