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The order of increasing energies of the orbitals follows:

(A) 35, 3p, 4s, 3d, 4p

(B)3s, 3p, 3d, 4s, 4p

(C) 35, 3p, 4s, 4p, 3d

(D) 3s, 3p, 3d, 4p, 4s