Which of the following is true about convergent evolution of potato and sweet potato?

Potatoes are members of the Solanaceae family, while sweet potatoes belong to the Convolvulaceae family. Both potatoes (stem tubers) and sweet potatoes (root tubers) store reserve food material (starch) in underground structures. This adaptation allows both plants to survive harsh environments where above-ground plant parts may be exposed to frost or drought. This is also an adaptation to get protection from grazing animals.