Kayla has a cat with blue eyes. The color of her cat's eyes is determined by DNA. The DNA directs which substance to construct these eyes?

A. lipids

B. water

C. proteins

D. carbohydrates

C. Proteins

A. makes no sense, because lipids are fats. They are used for insulation, energy storage, etc.

B. makes no sense, because water cannot carry out processes.

D. makes no sense, because carbohydrates don't build things.

Proteins, depending on their shape, have different duties. They are the building blocks of organisms, and create things (ranging from other proteins to eyes).

The answer is C. Proteins