An energy analyst forecasts that the price per barrel of crude oil five years from now will range between $ 75 and $105. Assuming a continuous uniform distribution, the probability that the price will be less than $ 80 five years from now is closest to:（）

A. 5.6%.

B. 16.7%.

C. 44.4%.

天然状态下的洪积扇中，由山口向平原地下水的水化学作用由溶滤作用为主转化到以浓缩作用为主，矿化度由（）到（）。（）

A、大到小

B、小到大

C、不变

D、以上都不正确