Select the correct answer. Which statement best expresses how the author develops

Select the correct answer.
Which statement best expresses how the author develops the theme in the poem? A.
The author uses descriptions of birds and trees to show an appreciation for nature. B.
The author uses descriptions of the months to show how fast time passes in life. C.
The author describes March and April to show how pleasant spring is. D.
The author describes nature to show how fast time moves in spring.