Answer:
D - They release water vapor when they exhale.
Explanation:
Behavior is determined by multiple factors. My best guess.
I believe the answer is: A) an uncompromising belief that they were the superior race
By adopting the belief that they are superior, they feel that they have the right to kill and execute members of different cultures like animals. This also make them feel that they are the most suitable rulers for the world, which they use to justify their actions when they invade neighbouring countries.
It became the largest nation in the world
