The author is indicating that it is ironic that tea is the symbol of Britain when tea does not come from Britain at all. As that tea has become a worldwide parody of Britishness contains no indigenous ingredients.
What is the significance of tea as a British symbol?
Tea became more popular than coffee, chocolate, and alcohol in England because the British East India Company held a stranglehold on the tea industry.
Tea was viewed as innately British, and the British government supported its usage because of the cash collected from tea taxes.
Thus, option D, it is ironic that tea is the symbol of Britain when tea does not come from Britain at all is correct.
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