If the Lowercase Letter K Appears at the End of an Air

If the lowercase letter k appears at the end of an air mass identification code,what can be said about the changes likely to happen within that air mass?

A) The air mass is likely to become more unstable.
B) The air mass is likely to become more stable.
C) The air mass will not undergo any air mass modifications.
D) The expected air mass modifications are impossible to predict.