Archaeologist: An ancient stone building at our excavation site was composed of three kinds of stone—quartz, granite, and limestone. Of these, only limestone occurs naturally in the area. Most of the buildings at the site from the same time period had limestone as their only stone component, and most were human dwellings. Therefore, the building we are studying probably was not a dwelling.

Question: Which one of the following, if true, would most strengthen the archaeologist's reasoning?
Options:
A. Most of the buildings that were used as dwellings at the site were made, at least in part, of limestone.
B. Most of the buildings at the site that were not dwellings were made, at least in part, from types of stone that do not occur naturally in the area.
C. Most of the buildings that were built from stones not naturally occurring in the area were not built with both quartz and granite.
D. Most of the buildings at the site were used as dwellings.
E. No quartz has been discovered on the site other than that found in the building being studied.
Answer: "B"