On His Last Full Day in Office in 2016, President

On his last full day in office in 2016, President Barack Obama commuted the sentences of 330 federal inmates, most of them drug offenders who he felt were serving overly harsh sentences.His actions were an example:

A) the president's right to grant unconditional reprieves and pardons of federally convicted persons.
B) how presidents give orders to the executive branch, including federal prisons.
C) how presidents sometimes exercise veto power over congressionally written sentencing rules and guidelines.
D) how presidents may act only when fully free of any democratic or public pressure.