After realizing that she had anger issues, seena enrolled in a kick boxing course to vent her anger. this is an example of which defense mechanism

Displacement

Displacement refers to a defense mechanism that involves transferring emotions from the target source or person to a different person or situation. Displacement is simply redirecting an impulse (often anger) to an alternative source. 

In Seena’s instance, instead of removing her anger on her family, friends or colleagues, she is redirecting it by releasing it through kick boxing.

the 4th option is the answer