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

How to make brown food coloring
Find two colored dyes that are opposites on the color wheel.
Red and green, orange and blue, or yellow and purple can all be combined to make brown.
You can use liquid or gel food dye.

Select from the following.
(a). Each color should be based on the specific color wheel that the recipe calls for. Oil-based dyes should come out brown.;
(b). Gel food dye is usually preferred because you don't need very much to get vivid colors. Mix the color in a 1:1 ratio.;
(c). Test several different dyes to make sure they don't mix badly. For example, first, if you have orange, yellow, green, and blue dyes, use a little bit of each each color to keep colors from mixing.;
(d). These kinds of dyes come in a powdered form, and usually contain organic materials such as berries. If using liquid food dye, use a small amount, about 1 tablespoon per gallon of water.;
(b).