The correct answer is C. A three-legged stand.
Explanation
According to the graph showing prefixes, suffixes, and roots of the words, it can be said that the word "tripod" is composed of the prefix tri, which refers to three, and the root "ped", which is related to the word "pod", which refers to the word foot. Therefore, the word tripod by the connection between the suffix "tri" and the root "pod" can be interpreted as a word that refers to a three-legged object. So the answer is C. A three-legged stand.