Answer:
C: world; perish
Explanation:
The speaker uses the images of world and perish, by considering the two elements, fire and ice, which, some people believe, will cause the end of the world. He says that  desire (fire) or hate (ice) both can bring the destruction. In other words, the end of the world  and destruction mean that it will perish  in one way or another, acourding to what some people say.