The bell-shaped curve at the top of the figure below shows the distribution of a phenotype in a population at the start of an experiment. The three graphs (lettered A-C) beneath predict what the distribution will look like if a certain type of selection occurs. Which graph represents what the phenotypic distribution will look like if the population undergoes stabilizing selection? 
Definitions:
Economic Profit
A financial gain that exceeds both the explicit and implicit costs associated with business operations.
Natural Monopolist
A firm that can supply the entire market at a lower cost than any combination of two or more smaller firms, often due to economies of scale.
Maximum Price
A price ceiling set by authorities to prevent prices from going above a certain level, often to make goods affordable.
Pure Monopolist
A market structure wherein a single company exclusively controls the entire market for a particular good or service, facing no competition.
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