Explanation:
As it is given that there are six electrons with four of them unpaired in the degenerate orbital.
As in a p-orbital there are only 3 sub-orbitals, that is, [tex]p_{x}[/tex], [tex]p_{y}[/tex], and [tex]p_{z}[/tex]. In these sub-orbitals, a maximum of 6 electrons can be accommodated.
Th next higher orbital is d-orbital which can contain a maximum of 10 electrons. There are 5 degenerate orbitals present in a d-orbital.
So, a d-orbital can easily accommodate six electrons with four of them unpaired.
Thus, we can conclude that 5 degenerate orbitals are needed to contain six electrons with four of them unpaired.