Final answer:
The first state to pass a chiropractic licensing law was Kansas, which occurred in 1913. This event marked an important step in the professional regulation and acceptance of the chiropractic field. The correct option is A.
Step-by-step explanation:
The first state to pass a chiropractic licensing law was Kansas. This historical milestone took place in 1913. At that time, there was a growing movement for the regulation of the practice of chiropractic, which had been founded by D.D. Palmer in the late 19th century.
The licensing law in Kansas marked the beginning of broader acceptance and legitimacy for the chiropractic profession across the United States. Over time, other states followed suit by enacting their own licensing laws to regulate the practice of chiropractic within their jurisdictions. The correct option is A.