$6.02 \times 10^{20}$ molecules of urea are present in $100 \mathrm{ml}$ of its solution. The concentration of urea solution is

• A

  $0.001 \mathrm{M}$
• B

  $0.1 \mathrm{M}$
• C

  $0.02 \mathrm{M}$
• Correct answer
  D

  $0.01 \mathrm{M}$

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