Final answer:
The design principle that has been considered in this scenario is unity. Therefore, the correct option is C. unity
Step-by-step explanation:
The design principle that has been considered in this scenario is unity. Unity in art refers to the sense of completeness and cohesiveness that is achieved when all the elements in a piece work together harmoniously. In the given scenario, the small cottage and the bean stalk rising to the heavens create a unified composition, as they both contribute to the overall theme and narrative of the artwork.