Question

WHY D ORBITALS HAVE SAME ENERGY

Answer 1

Orbitals that have the same energy level are called degenerate.  Orbitals differ from each other in terms of the shapes (or probably electron density) and their own characteristic energy level. An analogy would be the most unique or pristine form of any art form. When orbitals have same energy or are degenerate they lose their uniqueness or an essential characterisitic that sets them apart from other orbitals.  Its nature or class becomes ordinary as others have the same property. Hence, the word ‘degeneracy’ is used to define orbitals having the same energy level.
 
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Answer 2

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Since electrons all have the same charge, they stay as far away as possible because of repulsion. So, if there are open orbitals in the same energy level, the electrons will fill each orbital singly before filling the orbital with two electrons.