Due to the fact that the demand for tea was very high in the 19th century, its price increased much.  

A It was not until the 19th century that the demand for tea started to increase.

B It was its price which decreased the demand for tea in the 19th century.

C In the 19th century the price for tea didn’t increase despite the demand.

D The demand for tea was so high in the 19th century that its price increased much