Answer :
The correct option for increasing energy of orbitals is (a) 3d < 4s < 3p < 3s.
According to the Aufbau principle and the energy order of orbitals, the 3s orbital has the lowest energy level among the given options. It is followed by the 3p orbital, which has slightly higher energy. The 4s orbital comes next, with higher energy than the 3p orbital. Finally, the 3d orbital has the highest energy level among the options provided. This order is consistent with the filling of orbitals based on the periodic table and the arrangement of electrons in increasing energy levels.
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