Speculators profited handsomely since the price 【fluctuated】 fro

Speculators profited handsomely since the price 【fluctuated】 from the 1990s.
A、was stable
B、was flexible
C、was volatile
D、was regular
【正确答案】：C
【题目解析】：fluctuated波动的；was stable稳定的；was flexible灵活的；was volatile不稳定的；was regular常规的；故选C。