Why Was the Iraq War Compared to Vietnam

Why was the Iraq War compared to Vietnam?

A) Both had begun as nation-building projects.
B) Both featured free elections overseen by American officials that resulted in stable governments.
C) Both featured American policymakers with little knowledge of the country to which they sent troops.
D) Both the Vietnamese and Iraqi people welcomed American troops as liberators.
E) Both brought a government to power that was friendly with the United States.