For the first question regarding the artist's use of color to create emphasis in the image "Dancers Backstage" by Edgar Degas, the correct answer is:
by creating color contrast to focus on the main ballerina.
This approach draws the viewer's attention to the focal point of the artwork by using contrasting colors to make the main subject stand out against the background.
For the second question about how the artist created balance in "Still Life with Milk Jug and Fruit" by Paul Cézanne, the appropriate answer is:
by spreading the oranges out from the top left corner to the bottom right.
This distribution of oranges across the composition helps to create a sense of balance and harmony in the arrangement of the still life elements.