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In the lines spoken by Benvolio, the role darkness plays in the plot is related to secrecy. The character is suggesting that Romeo is hiding in the darkness of the night among the trees. This indicates a sense of secrecy or concealment as Romeo seeks to avoid being seen or discovered.
Therefore, the correct answer is:
C. secrecy
Darkness in this context represents a cover or a veil under which actions can take place without being observed, emphasizing the theme of secrecy in the plot.