Read this excerpt from Scene 1 of The Glass Menagerie. TOM: I am the narrator of the play, and also a character in it. The other characters are my mother Amanda, my sister Laura and a gentleman caller who appears in the final scenes. He is the most realistic character in the play, being an emissary from a world of reality that we were somehow set apart from. But since I have a poet's weakness for symbols, I am using this character also as a symbol; he is the long-delayed but always expected something that we live for.
What is most likely the meaning of emissary?

a. optimist
b. peacemaker
c. representative
d. spokesperson