Final answer:
Siegfried Sassoon and Wilfred Owen collaborated on a collection of poems while hospitalized, which highlighted the inhumanity of World War I.
Step-by-step explanation:
Siegfried Sassoon and Wilfred Owen collaborated on a collection of poems while they were both hospitalized during World War I. Their poetry reflected the grim reality of the war, contrasting the romanticized image that was often portrayed. They used their experiences to critique the war and highlight the senseless suffering and loss, much like the visual art of Käthe Kollwitz who depicted the mourning and trauma resulting from the war through her work. This approach to questioning the war through artistic expression enabled them to convey the powerful message of the inhumanity and brutality of the conflict.