A.) staying free of disease (physical)
B.) reflecting about yourself (mental)
C.) getting 8-10 hours of sleep each night (physical)
D.) engaging in 30-60 minutes of physical activity every day (physical)
Since B is a mental activity...
The answer = B. reflecting about yourself
Good Luck!
It sounds most like a generalized anxiety disorder but there could also be some OCD in there.
The answer would be, Stop smoking, walk to school instead of driving to school, use recyclable products.