The optically active tartaric acid is named as D - $(+)$ - tartaric acid because it has a positive

• A

  optical rotation and is drived from D - glucose
• B

  $\mathrm{pH}$ in organic solvent
• Correct answer
  C

  optical rotation and is derived from D - (+) glyceraldehyde
• D

  optical rotation when substituted by deuterium

Solution

Positive sign is for optical rotation (dextro rotatory) and D - is for configuration. It is derived from

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