What is: Baht, Kip, Riel, Dong?

Is it :

A - the four members of the new Asian Boy Band "Powerfun MagicPack"
B - the onomatopoeic result of setting four blind dogs loose in Jimmy's House of Drums and Cymbals

or

C - The useless pile of currency I now have from each SE Asian country I went to.

The correct answer is C. Although I kind of wish there was a band called Powerfun Magicpack.