Question

A second plague invades the city of Thebes and Oedipus makes a declaration to find Laius' murderer.
A Climax
B Rising Action
C Exposition.
D Inciting Incident

Answer 1

Don't quote me on this, but possibly B? 

(Definition of a rising action)
a related series of incidents in a literary plot that build toward the point of greatest interest. Compare falling action. Examples from the Web forrising action Expand. Yet there was the evidence: complex, developed characters; rising action ; conflict and climax; heroes and villains.