Which structure has all of the hydrogen atoms correctly added to the compound shown below? 
Definitions:
Stratigraphic Timeline
A chronological ordering of layered sedimentary rocks, representing the sequential events in the Earth's geologic history.
Mesozoic Era
A major subdivision of geologic time from 251 million years ago (Ma) to 65 Ma; characterized by dinosaurs.
Jurassic Period
A geologic period and system that occurred about 201 to 145 million years ago, known for the prevalence of dinosaurs and the breakup of the supercontinent Pangea.
Numeric Age
Geologic age of a rock, sediment, fossil, or event calculated in thousands, millions, or billions of years before present; synonym: absolute age.
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