What material was typically used in the construction of stelae?

Stelae were typically erected as upright slabs of stone, which is why this choice is the correct answer. These stone monuments served various purposes throughout history, including marking graves, commemorating significant events, or displaying dedications and inscriptions. The durability of stone made it a preferred material, ensuring that the stelae could withstand the test of time and remain visible for generations.

In contrast, while wood, concrete, and brick could be used in various construction applications, they do not encapsulate the unique characteristics and historical significance associated with stelae. Wood is more susceptible to decay, which would limit the longevity of such monuments. Concrete, although it can be durable, does not carry the same traditional weight or ceremonial significance as stone in the context of stelae. Brick, while used for other types of monument construction, wouldn't provide the same artistic or historical resonance connected to the use of stone for stelae. Thus, the selection of stone as the primary material aligns with both historical practices and the purpose these structures served.