This is the correct option:
B. It has led to the invasion and occupation of countries suspected
of supporting terrorists.
Explanation:
Diplomatically, the strategy used by the Americans in the war against terror has not been wholly good.
It has led to two wars in Iraq and Afghanistan that have been stretched out longer than they would have wants them to.
The war has also worsened the diplomatic relations of US with other nations in the region and has cost US unnecessarily huge amounts of money to keep the war effort going without much success.