Final answer:
The tone developed by the simile in lines 11-13 of 'The Pardoner's Prologue' is A) humorous.
Step-by-step explanation:
The word that best describes the tone developed by the simile in lines 11-13 of 'The Pardoner's Prologue' is humorous. In these lines, the Pardoner compares himself to a pigeon sitting on a barn, which is a comical image.
The simile emphasizes the awkwardness and absurdity of his actions, as he stretches out his neck and cranes his head around, mimicking the movements of a bird.
This light-hearted and amusing comparison adds a humorous tone to the lines, highlighting the Pardoner's flamboyant and attention-seeking nature.