Final answer:
It is true that the number of for-profit healthcare organizations experienced a rapid increase toward the end of the 20th century, particularly noted during the 1990s with hospital consolidation trends (a).
Step-by-step explanation:
The statement that the number of for-profit healthcare organizations grew rapidly toward the end of the twentieth century is true. In the 1990s, the healthcare industry in the United States saw significant changes with increased consolidation, often referred to as hospital "merger mania."
This phenomenon was characterized by local hospitals and small doctors' offices being merged or acquired by larger systems to cope with the growing demand for healthcare services, driven in part by an aging and less healthy population. These transformations were aimed at improving efficiency and standardizing healthcare delivery through various means, including the advent of urgent care centers, telemedicine, new healthcare professionals, insurance mandates, and the incorporation of artificial intelligence in healthcare practices.