I believe the correct answer is B, because exercising takes self control and discipline <span />
Being physically active can increase ur chances of living longer and it reduces ur health risk. For the mental thing more focus and motivation. Being socially active can give u a more positive outlook on life
If the person who might get euthanized is mentally able to decide, then they should decide. If not, the closest relationship they have should decide (wife/husband, mom/dad). If no one else, a doctor.