Which of the following is not another representation for 2-methylbutane? 
Definitions:
System 2
A term often used in behavioral economics, referring to slow, deliberative, and analytical thinking, contrasted with fast, instinctive, and emotional 'System 1' thinking.
Neoclassical Assumption
Underlying principles of neoclassical economics that include rationality, individuals maximizing utility, firms maximizing profits, and markets tending toward equilibrium.
Rational Behavior
Human behavior based on comparison of marginal costs and marginal benefits; behavior designed to maximize total utility. See rational.
Cognitive Biases
Systematic patterns of deviation from norm or rationality in judgment, whereby inferences about other people and situations may be drawn in an illogical fashion.
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