Answer: C
(A) Urban infrastructure, such as charging stations, will become more widely available in city areas this year.
NOT about cars; claim is about cards, not infrastructure
(B) The performance of electric cars, in terms of speed and comfort, is on par with that of gasoline-powered cars.
the claim does not talk about performance as being important for city dwellers, only cost
(C) City dwellers are primarily motivated by cost savings when choosing a vehicle.
the claim assumes the cost is related to electric car sales, this statement is about costs. YES!
(D) The cost of gasoline will remain stable throughout the year.
while this talks about costs, it's talking about the opposite direction which is gasoline cars. nothing to do with the claim.
(E) The production of electric cars will be sufficient to meet the increased consumer demand this year.
while we can assume offer and demand is implied in car cost, we cannot tell whether demand was higher than offer when the claim was made. therefore, we need to discard this answer.