Sparva, unlike Treland’s other provinces, requires automobile insurers

Just an extension to this line of thought.

Even when there are fewer (not lesser ) accidents in the province of Sparva, the insurers are paying more than other provinces. This strengthens the fact that this is happening because of the less restrictive policy, which forces the insurers to pay for any treatment of an accident victim, whether preapproved or not.

Hence E only strengthens the conclusion

Can anyone explain how E is correct over B?

We need to strengthen the conclusion that it is due to less restrictive policy that insurers pay medical treatment in Sparva than in any other province.

A. Car insurance costs more in Sparva than in any other province. - This option provides no support for the conclusion. Even though insurance cost is more, it doesn't mean insurers compensate for more cost. This option would require additional support in order to strengthen the conclusion. Incorrect

B. The cost of medical care in Sparva is higher than the national average. - Irrelevant. Cost of medical expenses has nothing to do with who would be bearing the cost.

C. Different insurance companies have different standards for determining what constitutes emergency treatment. - We're discussing about all the insurers and not comparing them. Irrelevant

D. Fewer insurance companies operate in Sparva than in any other province. - For me, this option would weaken rather than strengthen as fewer insurers means monopoly. Incorrect

E. There are fewer traffic accidents annually in Sparva than in any of the provinces of comparable or greater population. - This option provides support to the argument. If there are fewer accidents means insurers needs to pay less from their pocket. Hence E

accidents annually in Sparva than in any of the provinces of comparable or greater population, then insurance companies has to pay for fewer accidents - Paying for fewer accidents can be the reason why insurers pay medical treatment in Sparva than in any other province

In E could you please elaborate when you say If there are fewer accidents means insurers needs to pay less from their pocket. Its not necessary - may be cost of fewer accidents may be very high

Sparva, unlike Treland’s other provinces, requires automobile insurers to pay for any medical treatment sought by someone who has been involved in an accident; in the other provinces, insurers pay for nonemergency treatment only if they preapprove the treatment. Clearly, Sparva’s less restrictive policy must be the explanation for the fact that altogether insurers there pay for far more treatments after accidents than insurers in other provinces, even though Sparva does not have the largest population.

Type- strengthen
Conclusion- Sparva’s less restrictive policy must be the explanation for the fact that altogether insurers there pay for far more treatments after accidents than insurers in other provinces, even though Sparva does not have the largest population.

A. Car insurance costs more in Sparva than in any other province.- Irrelevant, the car insurance costs is not relevant

B. The cost of medical care in Sparva is higher than the national average.- incorrect, this weakens the claim as it provides an alternate cause for insurers paying for far more treatments after accidents than insurers in other provinces.

C. Different insurance companies have different standards for determining what constitutes emergency treatment.- irrelevant

D. Fewer insurance companies operate in Sparva than in any other province.- irrelevant

E. There are fewer traffic accidents annually in Sparva than in any of the provinces of comparable or greater population.- Correct
One possible cause for far more treatments is a greater number traffic accidents in Sparva. But if there are fewer traffic accidents, then it strengthens our belief that Sparva's less restrictive policy is responsible.

Answer E
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The argument says that the insurers in Sparva pay for more accidents than for those in other provinces. Paying more for accidents is different from paying for more accidents.

Conclusion of the argument - altogether insurers there pay for far more treatments after accidents than insurers in other provinces, even though Sparva does not have the largest population. E is correct because it says "the accidents are fewer", so a lot many people claim those insurance. The explanation is that insurers are paying for any medical treatments (emergency and non-emergency services).
in order words this option establishes the relationship between fewer accidents and higher claim count.

I got E, (A, C, and D are irrelevant, B weaken the answer)