Government in united states provide medicare by setting up your employer with insurance companies that supported this government program. (the government is the one that has the right to choose the insurance company, not the employer)
In united states, a medicare could only be provided by employer for whom you are still currently working. It's no longer eligible if you are on retirement.
Answer: C. to move around from one setting to another.
Explanation: When writting nonfiction, the author have to be well plotted such that such makes and give his writing more freedom in moving around form one setting to another.
