Final answer:
A clinical social worker, as a mental health professional, is trained to consider the broad social contexts of people's problems and is likely to become acquainted with clients' homes or work settings.
Step-by-step explanation:
The type of mental health professional that has been trained to consider the broad social contexts of people's problems and is most likely to become acquainted with clients' homes or work settings is a clinical social worker (option b).
Clinical social workers have specific training in addressing social and environmental factors that impact mental health. They focus on how social and systemic factors contribute to individual and community well-being. By working closely with clients in their homes or work settings, clinical social workers are able to gain a deeper understanding of their clients' environments and provide more comprehensive care.