Final answer:
The context for where Sergio was found wandering after his mom was found dead is not provided, making it impossible to answer this question factually.
Step-by-step explanation:
Without the context of a book, film, or real-life event, it is not possible to provide a factual answer to where Sergio was found wandering after his mom was found dead.
This question appears to be related to a specific story or case study, which is not provided in the details.
Therefore, no accurate response can be given to the question of whether Sergio was found A.
In the woods near his house, B. At a neighbor's house, C. At a park, or D. At the police station