Answer: THE practice
Explanation:
like the pianist is the practice of the piano
What are her motives for forgiving each of them? = Why did she forgive them?
Complex because it is and independent clause paired with a dependent clause
Based on the given excerpt above taken from "A Modest Proposal", the one that shows the false premises wherein the author relies on it is that parents would be more willing to sell their children than be responsible or care for them. The answer for this would be the third option.