Question

Which feature of "Spring and Fall" serves as a motif in the poem?
a. the listener, who is a young child
b. the fallen leaves, which represent mortality
c. the allusion to paradise, which reminds readers of loss
d. the speaker, who uses second-person point of view

Answer 1

I'd say the correct answer is B) the fallen leaves, which represent mortality. 

Answer 2

The answer is  B.  the fallen leaves, which represent mortality