4d,5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

Higher the value of (n+1) for an orbital, higher is its energy. However, if two different types of orbitals have same value of (n+1), the orbital with lower value n has lower energy. Therefore, decreasing order of energy of the given orbitals is 5f > 6p >5p > 4d.