C. War has a significant impact on both soldiers and their loved ones.
The poem "Not to Keep" by Robert Frost explores the emotional and physical toll that war takes on soldiers and their relationships with loved ones. It highlights the tension between relief at a soldier's return and the underlying trauma and uncertainty that accompanies the experience of war. The soldier's injuries and the realization that he may be sent back to the front line emphasize the profound effects of war on both the individual and their partner, illustrating that their reunion is not as simple as it might seem.