Statement I : For $H{e}^{+}$ ion, the energy of electron in $3p-$ orbital is greater than that in $3s-$ orbital.
Statement II : Energy of an electron in single electron system depends only on principal quantum number. 

If statement I is incorrect, but statement II is correct. 

If both statements are correct, and statement II is the correct explanation of statement I

If both statements are correct, and statement II is not the correct explanation of statement I 

If statement I is correct, but statement II is incorrect.