Carrie has been instructed by her counselor to spend 10 minutes on her way to work every morning mentally repeating the word "calm" to herself. carrie is practicing a technique of meditation known as:

I believe the answer is concentration technique

Concentration technique is a type of technique that being done to influence our state of mind by repeating the desired stated of mind in our head over and over again. (you can see it through carrie's action that keep repeating the word "Calm" in order to achieve that state of mind)