If the roots of the equation $x^5-40 x^4-P x^3-R x-S=0$ are in geometric progression and the sum of the reciprocals of the roots is 10 , then $|\mathrm{S}|=$

• A

  $8$
• B

  $16$
• Correct answer
  C

  $32$
• D

  $64$

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