Air will move from area X to area Y.
Since area X has a higher temperature (22ºC) compared to areas Y and Z (both 18ºC), the air will move from the warmer area (X) to the cooler areas (Y and Z). The most direct answer considering your options would be area X to area Y, considering that both Y and Z have the same temperature.
If those options were included, please clarify or provide more options to accurately answer the question.