I'm pretty sure the answer is b.
Good luck, my pal.
Because low self-esteem can lead to depression and make it hard for a person to have healthy relationships with others. because low self-esteem comes from a bad diet, which is bad for a person's physical and mental/emotional health.
If you are alive then you are thriving and using energy.
If you just exist then you MAY be thriving and you MAY be using energy.
There is a difference