For similar cars and drivers, automobile insurance for collision damage has always cost more in Greatport than in Fairmont. Police studies, however, show that cars owned by Greatport residents are, on average, slightly less likely to be involved in a collision than cars in Fairmont. Clearly, therefore, insurance companies are making a greater profit on collision-damage insurance in Greatport than in Fairmont.
Which of the following is an assumption on which the argument depends?
- Repairing typical collision damage does not cost more in Greatport than in Fairmont.
- There are no more motorists in Greatport than in Fairmont.
- Greatport residents who have been in a collision are more likely to report it to their insurance company than Fairmont residents are.
- Fairmont and Greatport are the cities with the highest collision-damage insurance rates.
- The insurance companies were already aware of the difference in the likelihood of collisions before the publication of the police reports.
答案是A，实在没想明白，修车的费用跟保险公司的盈利有什么关系？
PS：我这里不知道为什么打不开逻辑讨论区的网页，所以没法去查，不好意思 | 
