What are some of the adverse consequences of foreign holdings of U$.$S$.$ dollars?

There are no adverse consequences as sending dollars abroad is America's most valuable export.

It can increase the value of the dollar. This makes American$-$made goods more expensive and foreign imports cheaper for American consumers.

It can lead to a surge in counterfeit dollars, especially overseas where the U$.$S$.$ Bureau of Engraving lacks enforcement powers.

It can motivate drug traffickers, foreign dictators, and money launderers to invest in the U$.$S$.$ since these individuals save in U$.$S$.$ dollars.

None of the above.