Which of the following statements about tea is false?

A.By the later eighteenth century, it was estimated that more tea was smuggled into Britain than was brought in legally.

B.In 1784 the Prime Minister, William Pitt, slashed the duty on tea, wiping out the illegal smuggling trade virtually overnight.

C.Adulteration disappeared immediately after the duty on tea was slashed.

D.Black tea gained more popularity than green tea, for sometimes poisonous chemicals would be added to make green 'tea' the right color.

正确答案：Adulteration disappeared immediately after the duty on tea was slashed.