Final answer:
The previous Receiver, Rosemary, chose to be released because she couldn't bear the pain of the community's memories.
Step-by-step explanation:
The question refers to the novel 'The Giver' by Lois Lowry. In chapter 18, it was explained that the previous Receiver-in-training, Rosemary, requested for release and the community accepted her request. She no longer wanted to bear the pain of holding the community's memories and made the choice to be released, effectively die. This tragic incident affected the entire community and led to a significant change in the community's rules: the Receiver-in-training mustn't be allowed to apply for release again.
Learn more about The Giver