The most accurate conclusion we can draw about how the writings of the Lost Generation were influenced by the great loss of life experienced during the First World War is:
They wrote literature in order to process their experiences of being involved in the war.
This response acknowledges the broader impact of the war on the Generation's psyche, encompassing not just direct involvement in combat but also the many ways in which they were affected by the war, including the societal changes and personal losses that came as a result.