Final answer:
In Norse mythology, the stars were not made from Ymir's body parts; instead, they were created from the sparks of Muspelheim. The correct option is A.
Step-by-step explanation:
The stars in the Prose Edda, a Norse mythological text, are said to have been made from the sparks that flew from Muspelheim, which is the land of fire.
These sparks were set in the sky by the gods to give light and designate the passage of time.
The option that says th stars came from Ymir's skull, teeth, bones, or brain is a misinterpretation. In the myth, Ymir's body parts were used to create various other elements of the world, such as his flesh forming the earth and his skull becoming the sky, but not the stars themselves. The correct option is A.