Answer:
C. The expedition's men must earn their place on nature's frontier through effort and endurance.
Step-by-step explanation:
The expedition's troops must work and endure to reach nature's border. The journal entry highlights the explorers' hard labor, poor nourishment, and terrible sleeping circumstances. Though difficult, the entrance is accepting and unfazed.
This implies that the explorers know they must suffer these trials to enter nature's border. Working as hard as the human body is capable of doing on the bare minimum of food—a test of endurance and effort—supports this viewpoint.