Best describes when people feel like they have the power to change their environment or behavior if they need or want to do so.

"A sense of control" best describes when people feel like they have the power to change their environment or behavior if they need or want to do so.

Research demonstrates that a key part of bliss is a sense of control over your life. The more you see yourself to be in charge, the better you feel.  

A sense of control implies having a sentiment of self-governance, of picking how you invest your energy, of doing your own work in your own specific manner.  

This is clearly valid about significant issues, for example, regardless of whether you can control when you leave work every night or whether you have any relaxation time.

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