Which of the following best represents the HOMO of butadiene shown below? 
Definitions:
Efficient Method
An approach or technique that achieves a desired outcome with the least amount of waste, effort, or expense.
Occupational Trends
Patterns or shifts in job growth, decline, or change in different sectors or industries over a period.
Price of Labor
The amount of money that is paid for the work done by employees or laborers.
Demand for Products
Consumers' eagerness and capability to acquire goods and services for certain prices.
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