Which of the following drawings represents a collection of acetylene (C2H2) molecules? The shaded spheres represent carbon atoms and the unshaded spheres represent hydrogen atoms. 
Definitions:
Pure Competition
A market structure characterized by a large number of small firms, free entry and exit, and a product that is considered perfectly homogeneous, leading to firms being price takers.
Average Total Cost
The total cost of production divided by the quantity produced, representing the per unit cost of production.
Industry Supply
The total amount of a product or service that is available for purchase within an industry.
Perfectly Competitive
A market structure where many firms sell identical products, there are no barriers to entry or exit, and no single buyer or seller can influence the market price.
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