Final answer:
The common theme that emerges from the excerpts is that society often judges a person's worth and promise by the color of their skin, which corresponds to option C from the student's choices.
Step-by-step explanation:
When analyzing the theme of a poem, we need to look at the text critically and consider the underlying messages that reflect issues of societal, cultural, and racial identity. The poem in question does not seem to be provided, but based on the information given, the student could be inquiring about poems that address themes such as racial prejudice, identity conflicts, or social inequality. One common theme that emerges from the excerpts is that society often judges a person's worth and promise by the color of their skin, which aligns with option C from the student's question. This theme is evident in how the characters deal with prejudice, the exploration of the social construct of race, and the real-world implications of racism detailed in the texts.