$(1)$ As an architect whose work took her to some of the more inaccessible areas of the American West, Mary Colter $(1869-1958)$ had to overcome numerous obstacles in the course of her long career. $(2)$ Of the many buildings she designed, perhaps the most problematic was Phantom Ranch, which is located north of the Colorado River at the very bottom of the Grand Canyon. $(3)$ The main problem was finding a way to transport supplies and building materials to a work site that could be reached only by mule or by boat. $(4)$ The immense chasm presented a formidable terrain containing a multitude of peaks, gorges, and ravines. $(5)$ Her solution was to minimize such needs by creating a design that called for use of those materials most readily available: rocks and rough$-$cut wood. $(6)$ Although conditions for the construction crews were, to say the least, less than optimal, Colter got the job done and Phantom Ranch became a major tourist attraction.

$(7)$ Colter further demonstrated her creativity in a design she developed for a rustic Grand Canyon hotel called Bright Angel. $(8)$ Again she used rock to great advantage. $(9)$ In constructing the hotel's massive fireplace, she arranged the rocks in the same geological order in which it appeared in the Grand Canyon itself. $(10)$

QUESTION:

Which sentence, if added as Sentence $10,$ would be most consistent with the writer's purpose and intended audience?

Wherever such originality and inventiveness might have come from, it sure worked wonders in this instance.

This bold touch was a perfect example of the originality and inventiveness that made Colter one of the most dynamic architects of her time.

Who could have anticipated such originality and inventiveness from an architect working on a project in the Grand Canyon?