Correct Option (1)
The statement explicitly asserts that "It is only the misuse of nuclear power which will trigger it [the Third World War]." This establishes a direct and exclusive causal link: the Third World War will commence solely due to the misuse of nuclear power. Consequently, if the Third World War were to occur, the involvement and application of nuclear power are an inherent condition.
Incorrect Options:
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Option 2: There will be no civilization left after the Third World War. The statement uses the phrase "with, the possible, end of civilization." The inclusion of "possible" indicates an uncertainty or a potential outcome, not a definite or guaranteed destruction of civilization. Therefore, inferring a complete and certain end of civilization is an overstatement.
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Option 3: The growth of nuclear power with destroy civilization in the long run. The statement specifically attributes the triggering of the war to the "misuse" of nuclear power, not its general "growth." Furthermore, it links this misuse to a potential war scenario, not a general long-term destruction independent of a conflict. This option introduces concepts (growth, long run destruction) not directly supported or implied by the given text.
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Option 4: The Third World War will not take place. The statement begins with "The Third World War, if it ever starts..." This conditional phrasing acknowledges the possibility of the war occurring. It does not provide any basis to infer that the war will definitively not take place.