of an offense for which the penalty is amended by this Act and was sentenced to a term of imprisonment for the offense, the sentencing court may, on motion of the defendant or the Director of the Bureau of Prisons, or on its own motion, reduce the term of imprisonment for the offense, after considering the factors set forth in section 3553(a) of title 18, United States Code, to the extent the factors are applicable, if such a reduction is consistent with— (1) this Act and the amendments made by this Act