Consider the substance represented by the following model. 
The physical properties of this substance would most closely represent the corresponding member of which functional group class?
Definitions:
CS
An abbreviation for Conditioned Stimulus, a term used in classical conditioning to denote a previously neutral stimulus that, after being paired with an unconditioned stimulus, evokes a conditioned response.
US
United States; a country located primarily in North America.
Classical Conditioning
A training method where a naturally occurring response is learned through linking an environmental cue with a natural stimulus.
Ivan Pavlov
A Russian physiologist known for his discovery of classical conditioning, a fundamental learning process.
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