Which of the following best describes the relationship between meaning and meter in this poem?

a. the trochaic meter mimics the sound of the speaker's breath.

b. the strict meter parallels the sound of the birds' wings beating.

c. the shifting meter emphasizes the erratic behavior of the birds.

d. the iambic meter highlights the classic nature of the bird as subject.

e. the anapestic meter illustrates the unexpected movement of the birds.