Passage Summary: Even though two books are very similar, it's probably because the authors lived similar lives, not because one copied the other.

Conclusion: The similarities between Novel X and Novel Y are likely just a coincidence rather than the result of plagiarism.

Reasoning: The authors of both books share very similar backgrounds and have experienced similar life events, which explains the overlap in themes.

Analysis: This is an 'Identify the Conclusion' question, so we must isolate the author's main point. The phrase 'it is more likely that' serves as a conclusion indicator, signaling the author's stance against the 'plagiarism' suspicion mentioned earlier. The final clause provides the evidence (similar backgrounds) to support this claim. Focus on the part of the sentence that dismisses plagiarism in favor of coincidence.