In the given question, a statement of Assertion is followed by a statement of Reason. Mark the correct answer.

Assertion: On 19 March 2003 the US launched its invasion of Iraq under the codename 'Operation Iraqi freedom'.
Reason: More than forty other countries joined the US-led coalition of the willing after the UN gave its mandate to the invasion.

The Assertion is correct but the Reason is incorrect.

On 19 March 2003, the US launched its invasion of Iraq under the codename operation Iraqi freedom and more than forty countries supported the stand of the US-led coalition on this. UN did not approve this invasion.Hence, R is incorrect.