Lucien concludes that homelessness can only be caused by people's inability or unwillingness to work to pay rent as opposed to a lack of available housing.
Why? Because there are many vacant apartments available in Lucien's building and those of his professional colleagues.
Maria responds by undermining Lucien's argument. She cites studies which contradict Lucien's presupposition that homeless people are unable/unwilling to work by showing that many homeless people in the city hold regular jobs.
Answer choice (E) is incorrect because the facts supporting Lucien's conclusion are the numerous vacancies in apartment buildings in the city. Maria does not offer an alternative explanation for why these apartments may be vacant. She simply notes that Lucien's explanation as to why they are vacant is incorrect.
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