There aren’t many professional coopers left；it’s practically an extinct profession．There was a time when every town and village had a cooper．He used wood and metal to bang out containers．A dry cooper would make barrels to hold dry goods Line such as tobacco or cereal．A dry tight cooper made watertight casks that might(5)hold flour or gunpowder．A wet cooper made containers that could with stand pressure and hold liquids like vinegar or beer．A white cooper concentrated on washtubs，butter churns，and buckets of all sizes．These days，coopers exist primarily to accommodate the wine industry；certain fine wines and cognacs are still aged in oak barrels，most made by machine，not by hand．
Select one answer choice．
Based on the information in the passage，it can be inferred that in modern times．the most common cooper is