Why Have Weapons of Mass Destruction (WMD)become Easier to Acquire

Why have weapons of mass destruction (WMD) become easier to acquire?

A) The norm against acquiring WMD has become less accepted.
B) The knowledge of how to make the weapons has become easier to obtain.
C) Countries with WMD have become more likely to sell the weapons to other countries.
D) Countries have become less concerned about the proliferation of WMD.
E) Countries have stopped funding the International Atomic Energy Agency.