Answer:
D) The soldier maintains love for his country despite losing several members of his squad in a battle.
Step-by-step explanation:
In literature, a flat character is one that does not undergo a transformation throughout the story. In most stories, characters develop and change through time. This is also a consequence of the experiences that they acquire. However, in the case of flat characters, these rarely change. Moreover, we usually only learn about one side of their personalities, without learning much about the character's other interests and contradictions.