Rukmani met Kenny when he went to her hometown to cure her sick mother. Then Kenny became the village doctor. Rukmani was in debt to Kenny because he "helped" her so she could conceive children. Rukmani married Nathan at the age of 12 and says than she is unable to have a child.
The preposition of the sentence would be the word "of" since it relates the subject, the Incas, to the clause, which is "possessions with special knotted cords called quipu."
Pacing is moving a story forward with a certain speed. So the correct answer should be slow. To slow a scene to the point of using a coma, add a lot of these. Since all of the sentences are relatively long with a lot of commas and all of that slows the tempo down.
