The correct option is B Cotton
The British had always woven cloth out of wool and flax. From 17th century country, had been importing bales of cotton from India. Till early 18th century spinning was a very slow process. But a series of technological invention fill the gap between the speed in spinning raw cotton into yarn. From the 1780s, the cotton industries in Britain symbolised industrialisation in Britain. From now raw cotton had to be imported and finished cloth was exported.