The title of Achebe’s Things Fall Apart is an example of literary allusion. Option C is correct.
The title of Things Fall Apart by Chinua Achebe stems from a line in a poem by William Butler Yeats, "The Second Coming." The third and fourth lines of the poem are:
Things fall apart; the centre cannot hold;
Mere anarchy is loosed upon the world ...
Allusion is defined as a brief and indirect reference to a person, place, thing or idea of historical, cultural, literary or political significance. It is a passing comment and the writer expects the reader to have knowledge to indentify the allusion and understand why it is importance in a text.
