In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic…

In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. $\displaystyle \mathrm{n}=1, \mathrm{l}=0, \mathrm{~m}_l=0$ B. $\displaystyle \mathrm{n}=2, \mathrm{l}=0, \mathrm{~m}_l=0$ C. $\displaystyle \mathrm{n}=2, \mathrm{l}=1, \mathrm{~m}_l=1$ D. $\displaystyle \mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_l=1$ E. $\displaystyle \mathrm{n}=3, \mathrm{l}=2, \mathrm{~m}_l=0$ Choose the correct answer from the options given below: