Following stereo-structure of tartaric acid represents:

The compounds with the plane of symmetry are called meso compounds. The chiral compound also shows meso form.

Tartaric acid is a natural substance that sometimes crystallizes out from the wine.

The stereo structure shows meso form.

Tartaric acid and its enantiomers lack plane symmetry.

Thus, the molecule is chiral.

The tartaric acid stereo structure shows meso form. Meso compound exhibits a plane of symmetry. Meso tartaric acid is diastereomer. The molecule can be rotated 180 degrees around the axis and then superimposed. This is called $C_{\mathit{2}}$ symmetry. It is also a chiral compound so it is called meso compound.

Option:-(c) is the final answer

Stereo structure of tartaric acid shows meso form.