Which would be the best example of a breach of habitability?

Question

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Inoperable plumbing directly impacts the livability of a property as it affects basic necessities such as access to clean water and functioning toilets. A breach of habitability refers to conditions that make a property unfit or unsafe for living. While options A, B, and C could also negatively impact the livability of a property, they may not be considered as severe as inoperable plumbing.

Which Would Be the Best Example of a Breach of Habitability