Answer: A) will change her load of pottery to wings.
Explanation: a metaphor is a figure of speech that consists in making a direct comparison between elements that aren't obviously related, in order to create an image in the reader's mind. In the given lines from the poem "Turtle" we can see an example of a metaphor in the line "will change her load of pottery to wings" because it is comparing the turtle's shell to a load of pottery (without using the words "Like" or "as").