Some historical forts that are considered landmarks have not been kept up sufficiently. We need to observe and appreciate these forts, for they have a lot to teach us about our past. Thus, we should do whatever we can to ensure we maintain at least the most precious of these landmarks, at least for the sake of History.

On which of the followig assumptions is the above argument based?

If a historical fort is unique, its maintenance is of such importance that it justifies whatever cost is necessary to restore it.

Maintaining a historical fort does not damage it in a way that destroys its historical value.

Historical forts should be studied to provide information about living without modern amenities.

We know what information historians would be interested in deriving from a historical fort.

None of these