Answer: Even though you have not included the question heading, I have been able to locate it (provided below), and I can help you with the answer.
The question heading is the following:
"Based on your analysis, describe how the artist has created both unity and variety in the painting. Write your answer in the box provided below."
The answer is: The artist has created UNITY by suggesting that all the figures are in the same architectural space, which frames them, and also through their gestures and attitudes—they are all actively talking, reading, or meditating. In addition, he has created DIVERSITY by employing a significant array of colors, as well as individual and distinctive postures and expressions.
Explanation: Just to elaborate a little on the answer, it can be added that in this painting by Domenico Veneziano, an Italian painter from the early Renaissance period (15th century), the artist is representing an altarpiece where a holy conversation is taking place. A holy conversation is a scene in which a group of historical religious figures are engaged in conversation in front of the Virgin Mary and the infant Jesus. In the painting, one of the figures, which represents John the Baptist, gestures towards the Virgin and Child in order to direct the viewer's attention to their presence as the focal point of the altarpiece. Note how there is a suggestion of shadow in the background, as if to emphasize that this scene is really taking place. The array of colors is very diverse, yet harmonious, and the colors suggest different materials, textures, and surfaces.