The optically active tartaric acid is named $D-(+)$ tartaric acid because it is related to $D-(+)$ glyceraldehyde in terms of:

• A
  Optical rotation and derived from $D$-glucose.
• B
  The $pH$ in organic solvents.
• C
  Optical rotation and derived from $D-(+)$-glyceraldehyde.
• D
  Optical rotation when displaced by deuterium.