The correct answer is letter E.
Explanation: The domestic terrorism of Oklahoma City was the deadliest domestic terrorist attack in its history, when Timothy James McVeigh, a decorated former US military man, detonated a truck bomb in front of a federal government building in Oklahoma City.
With 168 dead and approximately 500 people injured, the US government began a quick hunt for potential bombers. He outlined profiles of attacks by extremist groups, mainly Islamist.