Final answer:
The incorrect recommendation for preparing children for transition is to 'let the children become accustomed to the new child upon arrival on their own,' which does not provide necessary support for the transitioning child. Therefore, the correct option is C.
Step-by-step explanation:
The question pertains to recommendations for preparing children for transition, particularly in educational contexts. One recommendation that is NOT advised is to 'let the children become accustomed to the new child upon arrival on their own' when a child enters your school mid-year. It is recommended to provide support and facilitate the transition for the new child. Active integration strategies and teacher-led introductions can help ease the child into the new environment and mitigate potential social or emotional difficulties. Such strategies may include transition activities, teacher introduction, and providing a buddy system to help the new student adjust. In contrast, helping a child who speaks another language learn essential English phrases and sharing information about separation anxiety with parents are positively recommended practices.