We’re given two conditional statements covering a city’s liability for injuries occurring on sidewalks, and whether or not that liability is justified.

(1) If an injury is caused by a damaged sidewalk, then the city is liable.

(2) The liability is justified only if the city had the opportunity to fix the damage before the injury occurred.

We need to find the right application of these statements— specifically a situation where the city would be liable for an injury, but should not be. As such, we’re looking to activate the sufficient condition of the first statement by finding an injury caused by a damaged sidewalk, and to deny the necessary condition of the second statement by showing that the city did not have the opportunity to fix the damage beforehand.