Question: Use the information below to answer the question. Cotton is a plant product used to make fabric. Cotton is made of cellulose, a fiber not digestible by humans. Cellulose is composed of many sugar molecules bonded together into long chains. Each sugar molecule contains carbon, hydrogen, and oxygen atoms. When cotton fabric is washed, wrinkles often form. The clothing industry uses chemicals to manufacture some cotton fabrics that are wrinkle-free. Dyes are also added to color the cellulose fibers in cotton. How would a clothing manufacturer separate colors to determine the purity of the dyes?

  Options: 
 A. through filtration
 B. by their boiling points
 C. by their freezing points
 D. through paper chromatography
Answer: D