Answer:
D. The necessity of hope for survival.
Explanation:
In the excerpt, the feeling of desiring something is engraved in human nature, and as such, this feeling can either be intensified or nullyfied - depending of external forces that might have an impact on this concept.
Desire can be seen as "hope", and hope makes the human individual reckless of everything else for the sake of its own survival. With this said, it is fair to state that desire represents hope, and it is needed for survival.