Correct Answer - Option 1 : Nuclear power will be used in the Third World War.
The Third World War, if it ever starts, will end very quickly with the possible end of civilization. It is only the misuse of nuclear power which will trigger it.
Now, we will examine the given inferences:
1) Nuclear power will be used in the Third World War. → True
2) There will be no civilization left after the Third World War. → False (as it is a possibility, not definite)
3) The growth of nuclear power will destroy civilization in the long run. → False (as misuse of nuclear power is discussed not growth)
4) The Third World War will not take place.→ False (as the possibility of third world war is being discussed in the given statement. So, it is possible but not definite)
Hence, 'Nuclear power will be used in the Third World War.' is the correct answer.