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# Which of the following statement is correct in relation to the hydrogen atom?

$\begin{array}{1 1}(a)\;3s-orbital\;is\;lower\;in\;energy\;than\;3p-orbital\\(b)\;3p-orbital\; is \;lower\;in\;energy\;than\;3d-orbital\\(c)\;3s\;and\;3p-orbitals\;are\;of\;lower\;energy\;than\;3d-orbitals\\(d)\;3s,3p\;and\;3d-orbitals\;all\;have\;the\;same\;energy\end{array}$

Sub shells of each shell in H-atom possess same energy level.
Hence (d) is the correct answer.