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

• Correct answer
  A

  $5\mathrm{f}>6\mathrm{p}>5\mathrm{p}>4\mathrm{d}$
• B

  $6\mathrm{p}>5\mathrm{f}>5\mathrm{p}>4\mathrm{d}$
• C

  $6\mathrm{p}>5\mathrm{f}>4\mathrm{d}>5\mathrm{p}$
• D

  $5\mathrm{f}>6\mathrm{p}>4\mathrm{d}>5\mathrm{p}$

Hence, the correct answer is option: 'A'.