Final answer:
The parents' statement that indicates an understanding of their daughter's bulimia nervosa is: "We'll focus on establishing a healthy eating routine."
Step-by-step explanation:
The statement made by the parents that indicates an understanding of their daughter's bulimia nervosa is option C) "We'll focus on establishing a healthy eating routine."
Parents of a client with bulimia nervosa need to understand the importance of establishing a regular and balanced eating routine to help their daughter manage her symptoms and develop a healthier relationship with food. This involves having consistent and structured meal times, planning nutritious and satisfying meals, and promoting a positive environment around food.
By focusing on establishing a healthy eating routine, the parents are showing their understanding of how to support their daughter's recovery from bulimia nervosa.