A man grows into a giant such that his linear dimensions increase by a factor of $9.$ Assuming that his density remains same, the stress in the leg will change by a factor of:

• A

  $\frac{1}{81}$
• Correct answer
  B

  $9$
• C

  $\frac{1}{9}$
• D

  $81$

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