Answer:
The answer is A.
Explanation:
The question is asking how the moon phase changes from a new moon to a full moon. You can see on the Picture that when it is a <em>full moon</em>, the order from left to right is Sun, Earth, and Moon.
The myelin sheath is the layer of fat cells that insulates most axons and speeds up the transmission of nerve impulses.
I believe the answer might be A