Where ... you at the moment? You ... in China or in Japan, aren't you? Выберите один ответ: a. am/is b. to be/is c. is/are d. are/are

The correct answer is d. are/are.
Explanation: "are" is used with the pronoun "you" in both parts of the sentence. The first part requires the present continuous form, and the second part requires the present simple form.