In "arrangement in black and white," irony is conveyed through select all that apply.
the woman's physical appearance
the host's responses to the woman
the woman's excessive commentary
the musician's reaction to the woman

I think that its either B, the host's responses to the woman, or C, the woman's excessive commentary. (I'm leaning more towards B, but i'm not sure.) 

One example that establishes irony is woman asking if the musician is "grateful" for being introduced to white people and the host's contradictory response. I hope this helped! :)

In "Arrangement in Black and White," by Dorothy Parker, the irony is conveyed through the host's responses to the woman.

"He's over there by the bookcase," she said. "Let's wait till those people get through talking to him. Well, I think you're simply marvelous, giving this perfectly marvelous party for him, and having him meet all these white people, and all. Isn't he terribly grateful?"

In the above statement, the host's contradictory statement and the use of the word "grateful" convey irony. In the setting, the guests remain the innocent parody of the society's prejudice whereas, the audience recognizes the racism.

no why will u hate it