Which of these is an expressed power of congress a) admitting new states b) creating a national banking system

c) eliminating amendments to the constitution

d) determining what is cruel and unusual punishment

Creating a national banking system was ruled by the Supreme court to be an implied power. Eliminating ammendments is rather tedious and does not take place on a regular basis. So you're left with A or D and I would say the Constitution makes it quite clear that admitting new states is an expressed power in Article 4 of the Constitution.

the correct answered its A