I'm raising funds to help cure XYZ disease. If you don't donate, then you're part of the problem, is the sentence that involves a logical fallacy.
A sentence which contains use of faulty reasoning, while the development of an argument is being presented in the sentence, then it is known as a logical fallacy,
In the given statement it is to be ascertained that not giving funds for curing a disease does not make someone responsible for the problems that arise out of such diseases.
Hence, option D holds true regarding a logical fallacy.
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