Final answer:
A. The sentence foreshadows a dangerous encounter with hostile natives.
Step-by-step explanation:
The sentence 'And it was not dissipated by somebody on board assuring me earnestly there was a camp of natives - he called them enemies! - hidden out of sight somewhere' from paragraph two of Heart of Darkness part 1 foreshadows a dangerous encounter with hostile natives. This sentence suggests that the crew is unsure of the natives' intentions and views them as enemies. It highlights the potential danger and tension that the protagonist, Marlow, may face as he continues his journey into the unknown.