Final answer:
The correct answer is c. 75%. A significant majority of mentally disabled individuals reside in developing countries, which lack the necessary resources to provide adequate mental health care.
Step-by-step explanation:
Approximately 75% percent of the world's 444 million mentally disabled people live in developing and poor nations that spend almost nothing on health care for the mentally ill. Therefore, the correct answer to this question is c. 75%.
The disparity in health care resources for the mentally disabled is stark between developed and developing countries. This not only impacts the accessibility to mental health services but also contributes to various societal issues such as higher unemployment rates among people with disabilities, which is significantly pronounced in these regions. While the developed nations have structures in place to support individuals with disabilities, including mental health disorders, developing countries often lack the resources, resulting in a high percentage of mentally disabled individuals without adequate care.