【单选题】

{{B}}Questions 1 to 5 are based on the following conversation.{{/B}}

A、
A、Because there was a shortage of men and women in the are
A、
B、Because mining communities were then separated from the rest of the country.
C、Because the mining runnels were too low for the horses to pull trucks of coal through.
D、Because the mine owners were unable to make men and women work longer hours and stay down the mine all day.