Answer:
The right choce is:
It feared Iraq possessed weapons of mass destruction.
Step-by-step explanation:
The George W. Bush administration´s main reason for justifying the invasion of Iraq in 2003 was the assumption that the Saddam Hussein´s dictatorship still possessed weapons of mass destruction (chemical weapons), having failed its international obligations to destroy them after the First Gulf War. 9/11 was a very recent event and it was feared those materials could get in the hands of terrorists, according to the line of the US government. After the brief war against the Iraqi army, the US army failed to find those weapons in the regime´s stockpiles.