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: The sack of potatoes had been placed above the bag of flour, so it had to be moved first.
 Question: Why does the 'it' refer to the sack of potatoes?

A: Because Its on top.
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Q: Sentence: The police arrested all of the gang members. They were trying to stop the drug trade in the neighborhood.
 Question: Why does the 'They' refer to the police?

A: Because The police would be stopping the drug trade, the gang would not.
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Q: Sentence: Tom said "Check" to Ralph as he took his bishop.
 Question: Why does the 'his' refer to ralph?

A:
Because Tom was taking the action to take the bishop and would be putting the King in check.
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