Final answer:
An Acroterion is a pedestal for a sculpture or ornament at the apex or lower corners of a pediment, often found in classical architecture and sometimes serving a protective purpose in historical contexts.
Step-by-step explanation:
The term for a pedestal for a sculpture or ornament at the apex or at each of the lower corners of a pediment is an Acroterion (B). An acroterion is typically found in classical architecture, adorning the corners and peak of a pediment, which is the triangular space forming the gable of a pitched roof. For example, the pedimental sculptures from the Temple of Aphaia at Aegina moved toward a more naturalistic style of the Classical period after the Archaic, with figures scaled to fit the triangular gable and often serving a protective purpose. Furthermore, these sculptures, such as the Gorgon Medusa at the Temple of Artemis at Corfu, sometimes featured figures that were believed to have apotropaic properties, aimed at warding off evil.