Cultural diffusion is the spread of cultural beliefs and social activities from one group to another. so the answer is A.
The income divide and excesses of the rich during the Gilded Age caused "widespread corruption" and a rise of a "counter culture" in the arts that challenged the status quo.
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.