Answer :
The answer is A, Jörmungandr.
Ratatoskr is a squirrel running up and down Yggdrasil carrying messages, Fenrir is a wolf, and I’m going to assume you mean Auðumbla, the cow.
Ratatoskr is a squirrel running up and down Yggdrasil carrying messages, Fenrir is a wolf, and I’m going to assume you mean Auðumbla, the cow.