The correct options are
A The tunnels could collapse cutting the workers off.
B The suffocation due to poisonous gasses in the mine.
C Flooding of the tunnels in the mines.
Working in a coal mine is dangerous. Workers face many issues like the collapsing of the tunnels. The mines could flood with water due to various factors. As the workers deal with dynamites to blast coal, they are also exposed to poisonous gasses.