I would most likely calmly tell them that I am a citizen of the United States too, and I demand a table. If they still will not seat me, I would probably calmly exit the restaurant and find somewhere that will. That's on them for not seating someone because of their race or culture.
Hope this helps~!
~Mistermistyeyed.
I think that it is B: Joyful, because there is no distress, such as, "Hurry, the queen has been killed!" or an angry description. The tone is very calm but the best answer would be joyful, as singing is usually joyful.