Answer:
A psychologist studying Matias's case is likely to belong to the field of:
b. developmental psychology.
Step-by-step explanation:
The field of developmental psychology is related to a child developmental processes, which states that there are stages of development according to the age of the child. A preeschoolar should be at a development stage in which he can be more independent, and can be able to socialize with other people besides his or her family members.