I believe the correct answer is: The narrator's superior pigs and his demand that the villagers pay for the damage done to his pigs creates tension between the narrator and the villagers.
In this excerpt from the story “In a Native Village” from the “Ridan the Devil and the other stories”, written by Louis Becke, main conflict begins with narrator’s conviction that his pigs are superior and had done no wrong to other villagers when they escape from his property: “Next morning the seven piglets were returned one by one by various native children. Each piglet had, according to their accounts, been in a separate garden, and done considerable damage… I gave each lying child a quarter-dollar.” Their next escape resulted in losing their tails while confronting the other pigs, for with the narrator demanded a considerable payment as he regarded this as their escape from the “cruel death”. This situation cumulated the tension between the villagers and the narrator and resulted in their fraud and narrator shooting his own pig.
Therefore, I would say that the narrator advances the plot of the story with his demand that the villagers pay for the damage done to his superior pigs, which creates tension between the narrator and the villagers.
The effect of the couplets in "To My Dear Loving Husband" and "To the King\s Most Excellent Majesty" is that D) they allow a poet to link lines of poetry together using sound.
