A corporation proposes to put an end to the unauthorised dumping of building waste at the culvert on the town's edge by fencing the culvert and its approach. Which of the following is an assumption on which the corporation's proposal depends?

The proposal is to end the dumping, not merely to end it at that culvert, and a fence only shuts one place. If a second piece of waste ground lies as near and as unwatched, the lorries turn into it the same night and the town is exactly as it was, so the proposal takes for granted that there is no such place. When the fence goes up is a matter of programme, not of principle; the waste is a nuisance wherever it originates; and the corporation's own vehicles would be shut out by the fence along with everyone else's, so the proposal does not depend on their innocence.