Assuming the mass of the earth as $\text{6.64}\times {10}^{24} \mathrm{kg}$ and the average mass of the atoms that make up the earth as $40 \mathrm{u}$ (atomic mass unit), the number of atoms in the earth is approximately

• A

  ${10}^{30}$
• B

  ${10}^{40}$
• Correct answer
  C

  ${10}^{50}$
• D

  ${10}^{60}$

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