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Answer:
A it gives a firsthand account confirming that members of all social classes drank tea
edge lol
The source was able to extend the information that MacGregor presents because it gives a firsthand account confirming that members of all social classes drank tea.
What does the Source quote?
The source quoted that in the morning, we see many around a small tables where the coal-carters and workmen are emptying their cups of delicious beverage.
Hence, the source gives a firsthand account confirming that members of all social classes drank tea.
Therefore, the Option A is correct.
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