Answer:
9. C. Gradation. Rhythm can be created by gradual change of lines, shape or shade of the color. Harmony - means a relationship of different portion of a design. Harmony should be achieved through judicious use of color, shape, and texture to give a feeling of oneness.
10. B. Primary colors include red, blue and yellow. Primary colors cannot be mixed from other colors. They are the source of all other colors.
11. B. These are color combinations created by the equal mixture of two primary colors. On the color wheel, secondary colors are located between primary colors. According to the traditional color wheel, red and yellow make orange, red and blue make violet , and blue and yellow make green.
