Answer:
The author presents the Reverend as an eyewitness to multiple examples of Scoresby's good fortune, which adds reliability to his account.
Explanation:
According to the book "Luck" by Mark Twain, the story is told of an English war hero Lord Scoresby who is a total idiot but managed to achieve legendary status by sheer luck. The Reverend was an instructor to Scoresby at military academy and tells how Scoresby somehow got through military school even though he is a complete idiot.
Therefore the author advances the plot through the use of the Reverend character by presenting Reverend as an eyewitness which adds reliability and credibility to his account.
The answer is:
A. iambic tetrameter
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