Which description describes the word "crop" best in the following context "IThe meet has already attracted a "crop" of Olympic talent." 
If none of the descriptions is correct return None. 

description 1 : plant or animal product that can be grown and harvested extensively for profit or subsistence.
description 2: thin-walled expanded portion of the alimentary tract used for the storage of food prior to digestion.
description 3: to remove unwanted outer parts of an image.
description 4: learner, or someone who attends an educational institution.
description 5: short type of whip without a lash, used in horseback riding.
description 6: cultivation of plants and animals to provide useful products. Do not include the following keywords: plant, animal, portion, learner
user