Which of the following, if true, most strengthens the argument? A. Car insurance costs more in Sparva than in any other province. B. The cost of medical care in Sparva is higher than the national average. C. Different insurance companies have different standards for determining what constitutes emergency treatment. D. Fewer insurance companies operate in Sparva than in any other province. E. There are fewer traffic accidents annually in Sparva than in any of the provinces of comparable or greater population.