Plz solve ques 10

If $\mathrm{\pi }<2\mathrm{\theta }<\frac{3\mathrm{\pi }}{2}, \mathrm{then} \sqrt{2+\sqrt{2+\cos 4\mathrm{\theta }}} \mathrm{is} \mathrm{equal} \mathrm{to}$
(A) – 2cosθ
(B) – 2sinθ
(C) 2cosθ
(D) 2sinθ