The correct option is B 1s2,2s2p6,3s2p6d10,4s1
Cu:1s2,2s2p6,3s23p63d10,4s1
In case of copper, a completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital.