Which sentence does not contain any errors in comma usage?
AOtters live in cold waters eat mostly fish and float on their backs.
BOtters live in cold waters, eat mostly fish, and, float on their backs.
COtters live in cold waters, eat mostly fish, and float on their backs.
DOtters live in cold waters eat mostly fish, and float on their backs.
AOtters live in cold waters eat mostly fish and float on their backs.
BOtters live in cold waters, eat mostly fish, and, float on their backs.
COtters live in cold waters, eat mostly fish, and float on their backs.
DOtters live in cold waters eat mostly fish, and float on their backs.