Seymouria is a connecting link between

Seymouria is a connecting link between amphibians and reptiles.

The connecting link between amphibians and reptiles is called as Seymouria. Its larval stages show amphibian-like features whereas its adult stages show reptile-like features.

Seymouria was well-adapted with many reptilian traits to life on land, hence they were first considered to be just a primitive reptile, however, its not a true reptile, but just and amphibian closely associated with reptiles. It had a larval stage that resided in the water. Its skull looks like an amphibian skull, but the rest of the anatomy of the body and the formation of the skeleton is more like a normal reptile.

Hence the correct answer is an option (B).