The statement that best explains the conditions shown in the photograph is that lack of public support for the war made it safer for soldiers to remain isolated in trenches. The Option C is correct.
During the World War I, the Soldiers often found themselves in the trenches due to the lack of public support for the war. This isolation was partly driven by the widespread disillusionment and opposition to the war among civilians.
The trenches provided some safety from the dangers of open warfare such as artillery bombardments and machine gun fire which were prevalent during this conflict. These soldiers were hesitant to advance across open fields because of the high casualties they would face, and this reluctance to leave the trenches contributed to the stalemate on the Western Front.