5. For any $\varphi \in\left(0, \frac{\pi}{2}\right)$, we have
(A) $\sin \sin \varphi\cos \varphi>\cos \cos \varphi$;
(C) $\sin \cos \varphi>\cos \varphi>\cos \sin \varphi$;
(D) $\sin \cos \varphi<\cos \varphi<\cos \sin \varphi$.