Final answer:
Erin's parents can encourage her to eat a new food by providing rewards and creating a positive environment.
Step-by-step explanation:
Erin's parents can encourage her to eat a new food by providing rewards, such as praise or small incentives. They can create a positive environment around trying new foods, by making it a fun and enjoyable experience.
For example, they can involve Erin in the food preparation process or let her choose a new food to try at the grocery store. By using rewards and creating a positive atmosphere, Erin will be more motivated to try new foods and develop a broader palate.