Which structure represents a terpene likely to be found in nature?

Name: Which structure represents a terpene likely to be found in nature?
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Structure III represents a cyclic terpene with a characteristic isoprene unit, which is commonly found in natural terpenes like limonene, pinene, and myrcene. Structures I and II have linear and branched chains, respectively, which are less common in natural terpenes. Structures IV and V have double bonds, which are not always present in natural terpenes.

Which Structure Represents a Terpene Likely to Be Found in Nature