Multi-choice problem: Continue writing the next sentence in this paragraph:

How to mix light to make colors
Gather your materials.
You will need three flashlights, colored cellophane (red, green, and blue), three rubber bands, and a white wall. Try to use similar flashlights.

OPTIONS:
(A). This will help keep the intensity of each light roughly the same. A large sheet of white posterboard or several pieces of white copy paper can be used in place of a white wall.;
(B). Many people mistake a white poster or cardboard box for orange paint, so choose what you think would be the best color for your paint. Mix enough to make a 2:1 ratio of light and red.;
(C). You can also use various colored pencils, crayons, markers, and erasers. If you can't find any of these supplies, you can use your jewelry, an old toothbrush, or a pink lip gloss (try to match it to your color scheme).;
(D). Find something wooden, such as a wood table, to push shades and other colors onto. Find an reflective surface, such as a layer of paper or a basement floor.;
(A).