The mass of one molecule of the compound $C_6H_{12}O_6$ is .........

• A
  $1.09 \times 10^{-21} \ g$
• B
  $2.988 \times 10^{-22} \ g$
• C
  $5.025 \times 10^{-23} \ g$
• D
  $16.023 \times 10^{-23} \ g$