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%.

某烧结车间2台100m²烧结机，8小时生产烧结矿1800t，因设备故障双机停2小时。求当班的利用系数。