The question refers to a treaty signed in 1998 between NATO and Warsaw Pact countries. The correct answer is option 3.

Option 1 and 2 can be eliminated because the treaty was not signed at cities labelled as A and B. Option 4 can also be disregarded because the city labelled as D was not the location of said treaty.

Option 3 likely refers to the city where the historic agreement was signed. This could be presumed to be Budapest, Hungary, where the NATO-Russia Founding Act was indeed signed on 27th May 1997 - this is possibly the historic agreement referred to; however, the date and specific treaty are not accurately presented in the question itself.

Application of historical context and knowledge is necessary to correctly answer such question. Therefore, for future reference, students should understand the chronology of major historical events, specifically concerning global political history.