The theme that Viola's subplot develops in Act II and Act III of Twelfth Night is Deceit can be dangerous.
What is the subplot in Twelfth night?
The servants play a role in the subplot.
Olivia's servant Maria, whom she refers to as "woman," seeks vengeance on Olivia's egotistical steward Malvolio.
Maria takes advantage of this weakness by dropping love notes addressed to him that are purportedly written by Olivia.
Thus, the correct option is A. Deceit can be dangerous.
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