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

Correct option is A. 5f>6p>5p>4d
(n+l) values for:
4d = 4+2 = 6
5p = 5+1 = 6
5f = 5+3 = 8
6p = 6+1 = 7
∴ Correct order of energy would be 5f>6p>5p>4d