Answer:Death of a loved one. The death of a spouse or other loved one tops the list of the most stressful things we experience. Bereavement affects people in different ways. You may feel shock and sadness, anger or even guilt. You may feel your world has been turned upside down and you don't know how to go on without them.
Explanation:
The correct answer starts with "so the battle begins"
I think it is A) Reference
Working out: 6.25% = 4 half lives (20x4=80ma) 80ma is how old the rock is
