What is the harm to federalism if a state can tax a national bank?

Explanation:

The state of Maryland decided to tax the Baltimore branch of the Bank of the ... who could levy taxes and therefore the national bank was infringing on state powers ... had two significant effects on what federalism means for the United States.

It was letter d. Afghanistan.  The U.S. sent troops to invade Afghanistan in response to the attacks orchestrated by Al Qaeda led by Osama Bin Laden.  They destroyed the World Trade Center and the parts of the Pentagon as two airliners were used to crash into those two landmarks where many people were killed and injured as a result.