Irony is a situation in which the statement someway has an outcome that would not have normally been perceived.
"So foul and fair a day" is ironic because if a day has been negative is most likely isn't also seen to be positive.
Answer:
The theme of the story is freedom, marriage, our identity and independence.
The answer is D. "Plants about to sprout."
Given the context and the title of the passage, plants sprouting is the most logical choice. When the passage says, "Rooted, they grip down and begin to awaken," you can come to the conclusion that the author is referring to plants since the passage is about spring.