The painting "Oppy Wood" by John Nash most strongly conveys the idea of:
B. Hopefulness and energy in wartime.
This can be inferred from the depiction of the soldiers in the painting. The soldiers appear determined and focused, showing a sense of hopefulness and energy despite the challenges of war. The use of vibrant colors and dynamic composition further reinforces this idea, creating a sense of optimism and strength in the face of adversity.
In contrast, the idea of efficiency of the military might not be as strongly conveyed in this painting since the focus is more on the emotional and psychological aspects of wartime experiences rather than the tactical or strategic aspects of military operations.
