The thing which Thomas Melville found when he went home on the night of the Boston Tea Party, now housed in the Old State House in Boston is:
The activist Thomas Melville was among many others who joined in on the political protest called the Boston Tea Party which involved the throwing into the sea of many imported tea as a protest against the British.
With this in mind, when he went home on the night of the Boston Tea Party, he found a bit of tea which is a piece of historical relic as it now stays in the Old State House in Boston.
Therefore, the correct answer is option C
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