A. --你的国籍?
--我是中国人。
类似的还有:--What is your number?
--I am number XXX.
you should choose A. It means you are from China. In English,we cannot repeat some words in the question!
绝对是A
回答国籍应该用形容词
B,My nationality is China
A I'm Chinese .意为我是中国人,就是告诉别人“我的国籍是中国”。
absolutely A