Which of the following events took place on September 11, 2001?
A. President George W. Bush declared a war on terror.
O
B. UN inspectors found weapons of mass destruction in Iraq.
O
C. The U. S. military forced the Taliban from power in Afghanistan.
O
D. The terrorist group al-Qaeda used four airplanes to attack U. S. targets.

D

Explanation:

Four planes were hijacked and used them for destruction of the twin towers, the Pentagon,  and a field in Pittsburgh, Pennsylvania.

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.