In this scenario, Jack is most likely practicing the act of mindfulness.
Mindfulness refers to the act of maintaining a present awareness of the thoughts, feelings and surrounding environment.
The act of Mindfulness is a relaxation technique that help to live in the moment and ignore thoughts of both past and future.
Therefore, the Option A is correct because Jack is definitely practicing the act of mindfulness to help live in the moment and ignore thoughts of both past and future.
The missing options includes <em>"a) mindfulness b) tai chi c) biofeedback d) autohypnosis"</em>
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<em>brainly.com/question/12530450</em>
