Final answer:
The Prose Edda doesn't explicitly state what came from Ymir's hair, but closely related creation myths often link trees to a giant's hair in their symbolism. Option b
Step-by-step explanation:
The Prose Edda is an important source for understanding Norse mythology and cosmology, attributed to the Icelandic scholar and historian Snorri Sturluson. According to the Prose Edda, Ymir is the primeval being born from the ice of Niflheim meeting the fires of Muspelheim, and many things in the world were created from his body after he was slain by Odin and his brothers.
However, regarding what came from Ymir's hair, the correct answer is not explicitly mentioned within the traditional texts. More commonly noted, from Ymir's body, the earth was formed from his flesh, mountains from his bones, and from his skull, the heavens.
His blood became the seas and oceans. The question, as posed, doesn't match the source material directly, but based on similar associations in mythology, one could infer that trees are often associated with hair in such creation stories. Option b