Answer is A, a soaring bird. The speaker is comparing a bird in the sky to imagination due to the lines, "Swiftness of thy course," "Soaring through the air," "Thy pinions can surpass the wind." pinions: the outer part of a bird's wing including the flight feathers. etc.
Explanation: In the given excerpt from the poem "On Imagination" by Phillis Wheatley, we can see that imagination is compared to a soaring bird. This comparison is made to give the idea of imagination being limitless and without boundaries, just like the bird, imagination can go to the clouds and beyond the sky ("We on thy pinions can surpass the wind, And leave the rolling universe behind").
