Whom should you contact to begin the case closure process?

The child's teacher (option A) and pediatrician (option C) would not be able to provide the necessary information and support to begin the case closure process. Local law enforcement (option D) may be involved in the case, but they are not directly responsible for initiating the case closure process. Therefore, the best option is to contact the individuals listed in option B the child's parents, safety plan providers, GAL, service providers, and supervisor, as they are all involved in the case and can provide necessary information and support to begin the process.