Beta vulgaris (beet) is a plant in the Amaranthaceae family. It has numerous cultivated varieties, the most well known of which is the root vegetable known as the beetroot or garden beet. Other cultivated varieties include the leaf vegetable chard. The sugar beet, used to produce table sugar and mangelwurzel, which is a fodder crop. Sugar beet (Beta vulgaris) is a biennial plant in the Family Amaranthaceae, the tuberous root of which contains a high proportion of sucrose. It is cultivated in temperate regions with adequate rainfall and requires a fertile soil. The crop is harvested mechanically in the autumn and the crown of leaves and excess soil removed. The roots do not deteriorate rapidly and may be left in a clamp in the field for some weeks before being transported to the processing plant. Here, the crop is washed and sliced and the sugar extracted by diffusion. So, sugar yielding part of Beta vulgaris is root and not leaf or shoot. Thus, the correct answer is option C.