Which of the following is true of the invasion and occupation of Iraq? A) The invasion was quickly successful, and a model democracy was established in
Iraq.

B) Despite quick success of the invasion, a difficult occupation, fueled by a fierce
insurgency, followed.

C) Iraq quickly signed a treaty with Iran to resist American aggression.

D) None of the above

B) Despite quick success of the invasion, a difficult occupation, fueled by a fierce  insurgency, followed.

Explanation:

The United States led a coalition of countries to invade Iraq in 2003 due to a belief that the Iraqi leader, Saddam Hussein was hoarding weapons of mass destruction.

The invasion and defeat of the Iraqi forces took less than a month and so was quickly successful. The hard part however, came afterwards as the U.S. faced a difficult occupation and a fierce insurgency that lasted until the defeat of Islamic State in 2017.