单选题：根据以下内容回答题:Cotton，like silk，was discovered and made cloth by

根据以下内容回答题:Cotton，like silk，was discovered and made cloth by man before the historical period(76)．Its first recorded use was in India，where cotton cloth of very fine texture，almost(77)silk，was made．When the Spanish arrived in the New World，they found that the Incas，the Mayas，and the Aztecs knew(78)cotton cloth．Some of the cotton cloth made in Peru，even before the days of the Incas，(79)that it is kept in museums．
Cotton is the most important of all textiles．Even now，with many artificial materials(80)，more than half of all textile products are．made of cotton．
Cotton comes from a plant of that name．When the plant is mature，the cotton grows in a white ball around the seed．To(8 1)the cotton for market，the seed must be removed from the cotton fiber．This(82)by a machine called the cotton gin．Then the cotton is packed into huge bundles called bales，(83)are sent to the mills．There the fibers are combed(84)they will all be turned in the same direction．Next，the fibers are spun into thread．From the thread，the+cotton is w6ven into(85)．
请根据选项回答(76)题： A．begins
B．has begun
C．began
D．was begun