Air will move from area X to area Y.
In terms of thermal energy transfer, air moves from an area of higher temperature (area X, 22ºC) to an area of lower temperature (areas Y and Z, both at 18ºC). However, since air can only move from one area to another, the correct response is from area X to both area Y and area Z.
If you are to select just one option, the most appropriate response would be area X to area Z or area X to area Y, depending on the wording of the question. However, if you're looking for a definite direction, remember that thermal energy transfers downhill in temperature.