Final answer:
In Lois Lowry's novel 'The Giver', the receiver-to-be selected ten years before Jonas is Fiona. Her selection process was tragic and led to the careful approach of Jonas's assignment.
Step-by-step explanation:
The receiver-to-be who was selected ten years before Jonas in the novel The Giver by Lois Lowry is Fiona. She was evaluated during the December Ceremony when she was twelve years old, like all the children in the Community. However, due to the tragic outcome of her selection process, where she failed to be trained properly and requested release, the next selection of a receiver was approached with great caution, leading to Jonas's assignment.