For mesotartaric acid, the correct configuration for chiral carbon is

• A

  $2 \mathrm{R}, 3 \mathrm{~S}$
• B

  $2 \mathrm{R}, 3 \mathrm{R}$
• Correct answer
  C

  $2 \mathrm{~S}, 3 \mathrm{R}$
• D

  $1 \mathrm{D}, 2 \mathrm{~L}$

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