Final answer:
The most typical characteristic of an Etruscan Temple is having columns in front only, which contributed to the temple's frontal axial orientation and distinguished it from Greek temples.
Step-by-step explanation:
The characteristic most typical of an Etruscan Temple is columns in front only (C). This architectural feature distinguished Etruscan temples from their Greek counterparts. Unlike the Greek temples, which had a forest of columns surrounding them and were often accessible from multiple points, Etruscan temples presented a high podium and a deep porch with an entrance from the front only. They typically featured a frontal axial orientation, further emphasizing their frontality.
Etruscan temples were constructed with mostly mud brick and wood, materials much less durable than the stone and marble of Greek temples, and thus few Etruscan temple ruins survive today. The use of a high podium, a singular entrance, and the presence of columns at the front and not around the entire structure creates a distinctly Etruscan architectural style.