Urban crowdedness would be greatly relieved if fares on public transport were more reason

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A. offered
(答案→)B. charged
C. paid
D. spent
解析：动词offer主动提出；charge要价，充电，控告；pay付钱；spend花费；名词fare费用，常常指旅行的车费等，通常与动词charge连用。句义：如果公共交通中所收取的车费更为合理，城市里的拥堵情况会得到很大程度的缓解。故B正确。