Answer: D. students learning architectural design.
Step-by-step explanation: In the given paragraph we can find the explanation of how to calculate the area of a room, in square inches and then how to transform it into square footage by dividing it by 144. It also gives advice in how to calculate the area of a L-shaped room, by breaking the space down into different squares or rectangles. This passage is most appropriate for students learning architectural design, because the language is simple, the explanation is clear, and the students will find this information useful.