GKFix MCQ Question

What is the correct order of increasing energy for the following orbitals: 3s, 3p, 4s, 3d?

• A. 3s < 3p < 3d < 4s
• B. 3s < 4s < 3p < 3d
• C. 3s < 3d < 3p < 4s
• D. 3s < 3p < 4s < 3d