Which of the Following Was Not a Part of the Reformed

Which of the following was not a part of the reformed tax system devised by Darius I?

A) Each satrap committed his province to a specific amount of revenue each year.
B) Some regions were allowed to pay in kind.
C) Being a Zoroastrian reduced the amount of tax paid.
D) Silver was the empire's base of value.
E) The officials under the satrap were recruited locally.