Answer:
D)
Step-by-step explanation:
Early explorers faced all of the following challenges: an undependable food supply, uneasy relationships with the natives, and the lack of maps to chart their passage. Because of the long trip, the food was likely to get poisoned or go bad. Therefore, it was undependable. The Natives didn't appreciate that explorers were entering their lands, ergo, their relationship was quite uneasy. And, on top of that, there were VERY few maps of their region, making it quite difficult to know where they were. That's why the answer's D.