While on an Archaeological Dig in Europe, You Find a Stone

While on an archaeological dig in Europe, you find a stone tool that is rounded on one side and has had flakes removed from the other side, giving it the appearance of a tortoise shell.This is likely to be a(n) :

A) prepared core typical of prehistoric modern humans that inhabited this region.
B) example of the Levallois technique of Homo erectus.
C) completed tool that is similar to those you have seen from the Solutrean toolkit.
D) none of the above