What can a motif contribute to, or become, when it gathers larger significance throughout a text?
a.
an example of contemporary context
b.
a symbol
c.
a logical fallacy
d.
an example of historical context
e.
a thesis
i'm pretty sure it is either b or e

a motif contribute to, or become A SYMBOL, when it gathers larger significance throughout a text

Explanation:

When one gathers more importance to accentuate a mood or a the image, that reason serves as a symbol or allows an element associated to become a symbol

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."

to convince americans of the importance of others.