Answer:
C.) the presence of buds located in the potato eyes, which represent the nodes
Step-by-step explanation:
Presence of nodes and internodes is the feature of stem. Roots do not have nodes and internodes. Eyes on potato tubers are the nodes of potato stem and have axillary buds on them. These buds give rise to new plant upon plantation of tuber. Hence, despite being underground, the presence of buds on potato eyes confirms that it is a stem, not a root.