Which of the following combination get south facing flats?

Concept: In a two-row facing arrangement, when two parallel rows of objects (such as flats or houses) are positioned opposite each other with a given compass orientation, the row lying toward the north of the layout faces south (towards the other row), while the row lying toward the south of the layout faces north.

Application: The diagram shows two rows -- P, R, U in the upper row and S, T, Q in the lower row -- alongside a compass with north at the top. Since the upper row lies on the north side of the layout, it is the row that faces south; the lower row, lying on the south side, faces north.

Cross-check:

• S, T and Q are exactly the points of the lower row, which faces north, not south.

• U and P belong to the upper row, but T belongs to the lower row, so this trio mixes points from two different rows and cannot represent a single row-facing direction.

• Y and E do not appear in the diagram at all, so any combination containing them cannot be a valid row.

Result: The upper row's points -- U, R and P -- are exactly the south-facing combination, i.e. URP.