The correct answer is: a) Smaller size and flake tools.
Middle Paleolithic tools are characterized by their smaller size and flake tools. They are also known as Mousterian tools, after the type site of Le Moustier in France. Middle Paleolithic tools were made by Homo erectus and Homo neanderthalensis.
Large handaxes are characteristic of the Acheulean period, which preceded the Middle Paleolithic. Bone and antler tools were not common until the Upper Paleolithic. Rock art is not a type of tool, but rather a form of art that was produced by early humans.
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