One of you has written to ask "I wonder whether to write on both topics or to choose only one."
The instruction is to write "a short essay (200 words minimum)". So I am asking you to write one essay.
I list two topics. You should write about both, if you can, within the word limit. (You may write more than 200 words, of course, if you like.)
The two choices of (A) discrimination and (B) refugees are suggested, not mandatory. You could make your own topic to write about, if you prefer.