Final answer:
Monte Greenawalt founded Activator Methods after his life was dramatically changed by chiropractic care.
Step-by-step explanation:
Monte Greenawalt, whose life was dramatically changed by chiropractic, became a chiropractor and then founded Activator Methods. '
This company is well-known for developing the Activator Adjusting Instrument, which is a spring-loaded device used by chiropractors to deliver consistent low-force, high-speed chiropractic adjustments.
Greenawalt's contribution to the field is significant, as Activator Methods is now one of the most widely-used techniques of spinal manipulation amongst chiropractors worldwide.
correct option A. Activator Methods
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