This is a question with answer options. Goal: Create a spectrum of light using a prism

Which of the following methods is more reasonable for accomplishing this goal?

Options are:
(I). Make a room with a window dark. In the shade of the window have a hole. Let sun light through the hole and into the prism. A rainbow will appear.;
(II). Make a room with a window dark. In the shade of the window have a hole. Let moon light through the hole and into the prism. A rainbow will appear.;...I think the answer is
(I).