有一题觉得答案好像错了～

One author estimate that 40 perceng of New York Chinatown firms established during 1900~1950 utiilized such associations as their initial source of capital. However, recent immigrants and third or fourth generations of older groups now employ rotating credit associations only occasionaly to raise investment funds.

which of following can be inferred about rotating associations?

(B) they accouted for a significant portion of the investment capital used by Chinese immigrant in New York i the early twentieth century.

(C)third-generation members of an immigrant group who started business i the 1920's would have been unlikely to rely on them.

答案选C，我觉得unlikely好像不对 B似乎没什么错啊 请指教～ ^ ^