Final answer:
The Mental Health Act came into place in 1959 to aid in the treatment of vulnerable individuals.
Step-by-step explanation:
The act that came into place in 1959 to aid in the treatment of vulnerable individuals is the Mental Health Act (option c). This act was passed by Congress and aimed to improve the care and treatment of individuals with mental illnesses. It provided guidelines for the establishment of mental health facilities, funding for research and treatment, and protections for the rights and privacy of mentally ill individuals.