Which of the following molecules could be a structural isomer for the underlined molecule below? 
Definitions:
Homo Habilis
An extinct species of early human that lived about 2.4 to 1.4 million years ago, known for using stone tools.
Human Evolution
The lengthy process of change by which people originated from apelike ancestors, characterized by developments such as bipedalism, larger brains, and other traits.
Denisovans
An extinct species or subspecies of archaic humans in the genus Homo, known primarily from their DNA extracted from fossil remains found in Siberia.
Neanderthals
An extinct species of human, closely related to modern humans, that lived in Europe and parts of Asia until approximately 40,000 years ago.
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