Hutu supremacy over tutsi people contributed to the ethnic conflict between the two groups.
the word underlined in the sentence above can best be defined as

a.
the state of being the most powerful
b.
the intentional and organized killing of a group of people based on their ethnicity, race, religion, nationality, or other trait
c.
the extension of power of one nation over another, often by territorial acquisition
d.
patriotism or devotion to one's country