【单选题】

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

A、
A、They had to carry sacks of coal up steep ladders.
B、They had to crouch in tiny tunnels and dig the coal out.
C、They had to pull trucks of coal along passage that were only a few feet high.
D、They had to dig wider tunnels for women and children to work in.