The correct answer is D, as the US involvement in Afghanistan continued into the 2010s.
The war was declared by the United States after the attacks of September 11, 2001, with the aim of dismantling the terrorist network Al Qaeda and return safety to Afghanistan by eliminating the Taliban from power. After 2001, the North Atlantic Treaty Organization (NATO) was involved in the war, eventually executing combat operations, under the direction of US commanders. On December 28, 2014, NATO officially ended combat operations in Afghanistan and transferred full responsibility for security to the Afghan government through a ceremony in Kabul, marking the beginning of the new phase of the conflict.
On August 21, 2017, US President Donald Trump announced that the United States will remain involved in the war, with an unspecified increase in troops and no fixed deadlines for their withdrawal, although it was known that 4000 more soldiers arrived in that Asian country, counting with a total of 14,000 US troops and a total of 16,000 soldiers of all foreign occupation forces.
