Answer:
The correct answer is C. The inevitable reality of mass destruction by a common enemy.
Step-by-step explanation:
The Spiritus Mundi refers to a vision that the speaker of the poem has about the terrible destiny of people and the world. This vision features a sphinx (lion creature with a human head) that has spent 20 centuries in "stone sleep" and has awaken. In the second stanza of the poem this creature makes a spooky aparition: it is reeled by the "shadows of desert birds", and the speaker feels the darkness falling upon him. However, the speaker ignores the full identity of the creature. He/She is only certain that it is a "rough beast" that "shlouches towards Beethlem". This biblic refference implies that the sphinx is going to play the role of the second messiah (as Jesus is the first). Meaning, the creature is powerful and of divine origin (possibly the antichrist) yet it has dark intentions.