Chọn đáp án đúng: Everybody is going to be there....?

$$\begin{gathered} \mathrm{Câu} \mathrm{hỏi} \mathrm{đuôi} \mathrm{bài} \mathrm{unit} 9: \mathrm{Cities} \mathrm{of} \mathrm{the} \mathrm{future} \\ \mathrm{Everybody} \mathrm{is} \mathrm{going} \mathrm{to} \mathrm{be} \mathrm{there},......? \\ \mathrm{A}. {\mathrm{isn}}^{,}\mathrm{t} \mathrm{he} \\ \mathrm{B}. \mathrm{is} \mathrm{he} \\ \mathrm{C}. {\mathrm{aren}}^{,}\mathrm{t} \mathrm{they} \\ \mathrm{D}. \mathrm{are} \mathrm{they} \end{gathered}$$