Who is Tiamat A the old man who tells the story B the God of the land C the mother of the gods who resembles a dragon D a great warrior who frees the other gods

The answer would be C.

In Mesopotamian religion (Sumerian, Assyrian, Akkadian and Babylonian), Tiamat is a primordial goddess of the ocean, mating with Abzû (the god of fresh water) to produce younger gods. She is the symbol of the chaos of primordial creation. Tiamat is usually described as a sea serpent or dragon.