Where Was Osama Bin Laden's Final Hiding Spot and Why

Where was Osama Bin Laden's final hiding spot and why was it important?

A) Iraq - his hiding place also was a storage facility for weapons of mass destruction that we knew were there the whole time.
B) Afghanistan - after we kicked him out, he managed to come back which means we should have done a better job in Afghanistan.
C) Pakistan - it was likely that the Pakistan government knew where he was and was hiding him.
D) Egypt - he aided in the effort to overthrow the Egyptian government.