The correct answer is B. Compare and contrast
Step-by-step explanation:
The compare and contrast organizational structure is ideal for works that focus on analyzing the differences or common points of two subjects such as two campaigns, books, animals, etc. Indeed, this organizational structure allows author to better organize ideas either by describing the feature of subject A and then Subject B or by comparing specific qualities of both subjects at the same time.
In this context, for comparing the use of color imagery in two literary works the compare and contrast structure is the best as the writer wants to focus on differences and similarities, which is exactly the focus of this organizational structure.