What stone tools are characteristic of the Achulean period?

The Achulean period is primarily characterized by the development and use of large bifacial handaxes, which are prominently associated with Stone Age human ancestors. Among these tools, the Abbevillian handaxe is considered an early form that originated in the lower paleolithic, but the Achulean handaxe represents an evolution in tool-making techniques, featuring a more refined and standardized form. These tools were skillfully crafted through techniques that allowed for greater efficiency in butchering, cutting, and processing materials, marking a significant advancement in prehistoric technology.

The distinction of the Achulean period lies not only in the creation of these handaxes but also in their widespread distribution across various regions, indicating a level of adaptability and skill among early hominins. Therefore, the presence of both the Abbevillian handaxe and the more advanced Achulean handaxe embodies the technological progression observable during this period, making this answer correct.

Other tools mentioned in the other choices, such as the Levallois core and flake, are associated with the Mousterian period, while Mousterian sidescrapers and backed knives pertain to Neanderthal technology rather than the Achulean. Lastly, microblades and retouch tools generally appear in later