3. The curve represented by the equation $\frac{x^{2}}{\sin \left(19^{2007}\right)^{\circ}}+\frac{y^{2}}{\cos \left(19^{2007}\right)^{\circ}}=1$ is ( ).
(A) Hyperbola
(B) Ellipse with foci on the $x$-axis
(C) Ellipse with foci on the $y$-axis
(D) None of the above answers is correct
3.C.
$$
\begin{array}{l}
19^{2007}=19 \times\left(19^{2}\right)^{1003}=19(360+1)^{1003} \\
=19(360 n+1)\left(n \in \mathbf{N}_{+}\right) .
\end{array}
$$

Then $\sin \left(19^{2007}\right)^{\circ}=\sin (360 \times 19 n+19)^{\circ}=\sin 19^{\circ}$,
$$
\cos \left(19^{2007}\right)^{\circ}=\cos (360 \times 19 n+19)^{\circ}=\cos 19^{\circ} \text {. }
$$

Since $\cos 19^{\circ}>\sin 19^{\circ}>0$, the correct choice should be $\mathrm{C}$.