The correct answer is B) to kill as many Americans as possible and damage the US economy.
The other options of the question were A) to get the United States to recognize al-Qaeda as an official government. C) to incite the US into a holy war against Islamist countries. D) to force the US to release thousands of its members from prison.
The terrorist's main goal in committing September 11, 2001, attacks was to kill as many Americans as possible and damage the US economy.
Those attacks were the responsibility of Osama bin Laden, leader of the terrorist group al-Qaeda. It was bin Laden who affirmed that the terrorist's attacks committed on September 11, 2001, were due to many reasons such as the US troops presence in Saudi Arabia, the US sanctions against Iraq, the attack of Muslim people in Somalia, the attack of Jews to Muslims in Lebanon, and the constant support of the US to Israel.