Based on the excerpt, the feature of a comedy of manners which is being illustrated is: A. witty wordplay.
A comedy of manners can be defined as a type of dramatic comedy (play) that is witty and cerebral. Also, it is typically performed to depict and often satirize the manners affectations and behaviors of a contemporary society.
Based on the excerpt from the "The Importance of Being Earnest", we can infer and logically conclude the feature of a comedy of manners which is being illustrated is witty wordplay.
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