The cam therapy that americans have come to rely on heavily for treatment of musculoskeletal problems and that many insurance companies will now cover is

cam therapy that Americans have come to rely on heavily for the treatment of musculoskeletal problems and that many insurance companies will now cover is: chiropractic medicine.
Chiropractic medicine is a form of alternative medicine that is used for treatment in the mechanical disorder of the musculoskeletal system. Over the past few years, many  researches proved that this form of treatment is actually effective and could be depended on, making the insurance companies able to cover it.

It would be choice b (randomly selected)

To keep up with the demands of industrialization