During fighting, Sergeant Michael Dunne of the Canadian `Fighting Tenth' battalion is wounded in action and returned home to Calgary. Diagnosed as neurasthenic, he is honourably discharged and put to work in recruiting troops for the front.
Answer:
It looks like children working in a coal mine so i guess Gases, Mines could collapse, and possibly get sick from fumes or something.
The answer is B. You're welcome.
