Part A: The most reasonable inference to draw about what kind of king Oedipus is would be A. responsible and considerate.
Part B: The line from the play that best supports this answer is A. Oedipus. Tell me what is troubling you. . . . Never doubt that I will help you in every way I can. This line demonstrates Oedipus' commitment to his role as a king who cares for his subjects and is willing to assist them in their time of need.