The way Geijer’s comment supports MacGregor’s point is that C. It illustrates the popularity of tea in Britain during the 1800s.
This refers to the use of evidence to validate a claim to show that it is true or not.
Hence, we can see that from the complete information, we can see that Geijer made a popular comment that buttressed the point of MacGregor and this made tea the official tea of Britain in the 1800s.
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