Answer: C. Smell of mildew in a Vietnamese village.
Step-by-step explanation:
This book is based on the experiences of Tim O'brien during the Vietnam war.
He aimed to show just how the soldiers felt during the war as well as the need to know the environment of Vietnam in other to be more knowledgeable about the positions of the enemy.
The geography of the coastline, the fear the soldiers faced during wartime and the vivid description of the climate are all therefore, integral parts of the story.
The smell of mildew in a Vietnamese village would be the least related because it neither speaks of the environment nor of the feelings of the soldiers.