I honestly can't see how any of these options is a healthy strategy for coping with death and dying, however if I had to choose the last option would be the only one that might help. The other options are definitely very unhealthy coping strategies and would not be recommended at all. Visiting a dying person often would allow you to come to terms with accepting that someone you care about is dying and in some ways will prepare you for the inevitable. It can prepare you mentally, however it can be a highly distressing experience.
D. remaining well -hydrated while exercising is best, when you perspire from exercise you have to replace fluids or you will de-hydrate which is not safe.
Both Kyla and Tia will be in their zone. Even if they dicrease their heart rates by 20 beats per minute from 175 beats per minute. 155 beats per minute still falls under kyla's target heart rate zone and Tia's target heart rate zone.