Final answer:
The Gable roof shape requires the simplest frame compared to the Mansard, Cross-gable, and Cross-hip roofs, due to its less complex design and easier construction.
D is correct
Step-by-step explanation:
The simplest frame among the given options for roof shapes is the Gable roof. A gable roof consists of two roof sections sloping in opposite directions and placed such that they meet at the ridge, forming a simple triangular roof shape. This type of roof is easier to construct than the others mentioned, as it requires less complex framing and is generally less expensive.
In historical context, many New England Large houses featured the gable end facing the street for a stylish appearance. Moreover, buildings of lesser importance historically might have a single eave or gable roof, as noted from the comparison with the more complex double-eave hipped roofs used in imperial buildings.