Must be true. As shown below, if the city clears the sidewalk, the owner will be billed. If the sidewalk hasn’t been cleared within 48 hours, then the owner will receive a citation.

Could be false. If the sidewalk is covered after 24 hours, the city has the right to clear the sidewalk, but this isn’t a guarantee that the city will actually do it. It could be the case that the city doesn’t clear someone’s sidewalk (and that they wouldn’t be billed).

Could be false. If the sidewalk is covered by snow after 24 hours, the city has the right to clear it, but the city isn’t required to do so. If the sidewalk isn’t cleared after 48 hours, the landowner is cited, but this doesn’t guarantee that the sidewalk will be cleared.

Could be false. The stimulus does not provide information to support inferences about quantities of landowners; we don’t know what happens to “nearly all” landowners. It could be the case that these landowners’ sidewalks were cleared by the city before 48 hours.

Could be false. The bill comes from performing the service of clearing the sidewalk; it is still the case that if these landowners receive the service of the city clearing their sidewalks, then they will be billed.