Answer:
Option D would be the appropriate alternative.
Explanation:
- By either the late nineteenth century, even just several other companies controlled numerous hospitals. By restricting their care with only a single portion of the body, optometrists nevertheless gained significant social standing, which means whether optometry is a negligible but hardly exclusive profession.
- The proportion of health facilities operated by investor-owned firms has risen since before the 1960s.
The other options are mostly not linked to the case described. As such, the solution above is the right one.