Answer: Option (4) is the correct answer.
Explanation:
A stable air is defined as the one which tends to resist movement. On the other hand, an unstable air will easily rise from one place to another.
By nature, stable air masses are calm and free of any violent disturbances. These are most of the time noticed by their appearance of stratiform clouds or fog.
Thus, we can conclude that the statement it tends to resist rising is true about stable air.
