The topic which is shared by "Follow the Drinking Gourd" and "Swing Low, Sweet Chariot" are the idea about:
According to the ideas in the "Follow the Drinking Gourd" and "Swing Low, Sweet Chariot", we can see that they were written in order to teach slaves about the escape to freedom.
As a result of this, we can see that the shared topic or the main ideas in both the "Follow the Drinking Gourd" and "Swing Low, Sweet Chariot" are a thirst for freedom from slavery.
Therefore, the correct answer is option D
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