For similar cars and comparable 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, ttherefore, insurance companies are making a greater profit on collision damage insurance in Greatport than in Fairmont. In evaluating the argument, it would be most useful to compare ["the condition of Greatport's roads and streets with the condition of Fairmont's roads and streets", 'the rates Greatport residents pay for other forms of insurance with the rates paid for similar insurance by residents of Fairmont', 'the cost of repairing collision damage in Greatport with the cost of repairing collision damage in Fairmont', 'the level of traffic congestion in Greatport with the level of traffic congestion in Fairmont']