In this task you need to give reasons to justify the pronoun coreference relations. Each of the provided inputs contains a sentence with a target pronoun and a question about how to justify the coreference between a noun phrase and the target pronoun. Good practices involve the discussion about how the descriptions attached to the targeted pronoun relate to the noun phrase candidate in the question. The reasoning could come from one or multiple following knowledge types about commonsense: First: 'Property', the knowledge about property of objects (e.g., ice is cold). Second: 'Object', the knowledge about objects (e.g., cats have ears). Third: 'Eventuality', the knowledge about eventuality (e.g., 'wake up' happens before 'open eyes'). Forth: 'Spatial', the knowledge about spatial position (e.g., object at the back can be blocked). Fifth: 'Quantity', the knowledge about numbers (e.g., 2 is smaller than 10). Sixth: all other knowledge if above ones are not suitable. Write the sentence in natural language.

Q: Sentence: Grace was happy to trade me her sweater for my jacket. She thinks it looks great on her.
 Question: Why does the 'it' refer to the jacket?

A: Because my jacket. She thinks it looks great on her Grace was happy to trade me her sweater.
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Q: Sentence: Bob paid for Charlie's college education, but now Charlie acts as though it never happened. He is very ungrateful.
 Question: Why does the 'He' refer to charlie?

A: Because Charlie is the one who acts like it never happened.
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Q: Sentence: The sack of potatoes had been placed below the bag of flour, so it had to be moved first.
 Question: Why does the 'it' refer to the bag of flour?

A:
Because the flour is on top, and the subject is the potatoes, which is the item wanted here.
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