The correct answer is option d. "A cycle of history".
Explanation:
The poem “The Second Coming” by W. B. Yeats describes the horrible atmosphere of post-war Europe by using allegories of the Apocalypse and Second Coming as described in the Bible. The first two lines of the poem are "Turning and turning in the widening gyre" and "The falcon cannot hear the falconer". In the first line the gyre is a cycle of history at which people keeps turning without noticing that war is dangerously near, as falcon that keeps turning without hearing the falconer.
