Which terrorist organization claimed responsibility for the attacks on september 11, 2001?
a. the taliban
b. the iraqi terrorist organization
c. the palestine liberation organization
d. al-qaeda

The correct answer is D. The terrorist organization that claimed responsibility for the attacks on September 11, 2001 was Al-Qaeda.

Explanation:

The attacks of September 11, 2001 were a series of four bombings committed on the morning of Tuesday, September 11, 2001, by 19 members of the Al Qaeda jihadist network, through the hijacking of commercial aircraft to be hit against various targets, causing the death of 3016 people (including the 19 terrorists and the 24 disappeared) and leaving more than 6,000 injured, as well as destruction in New York of all the complex of buildings of the World Trade Center (including the Twin Towers) and serious damages in the building of the Pentagon (seat of the Department of Defense of the United States, in the state of Virginia), episode that would precede the War of Afghanistan and the adoption by the US Government and its allies of the so-called "war on terror" policy.

i would say b. or c.