Operation Iraqi freedom was launched by the US on:

19 March 2003

The correct answer is Option 2 - 19 March 2003

On 19 March 2003, the US launched its invasion of Iraq under the codename ‘Operation Iraqi Freedom’. More than forty other countries joined in the US-led ‘coalition of the willing’ after the UN refused to give its mandate to the invasion. The US lost over 3000 military personnel in this war. The invasion was to prevent Iraq from developing weapons of mass destruction. The ostensible purpose of the invasion was to prevent Iraq from developing weapons of mass destruction (WMD).