Shown is a table of the results of a study of grasshoppers showing frequencies of different size classes, along with the average number of offspring these individuals produce. 
Assuming that size is a heritable trait (and that the number of offspring is a good proxy for the fitness of the phenotype) , which type of selection is operating in this population?
Definitions:
Achievement Motivation
The drive or desire to accomplish goals or meet certain standards of excellence.
Interviewers' Preconceptions
Biases or pre-formed opinions that interviewers may hold, potentially influencing their judgment of candidates.
Manipulative Flattery
involves insincere praise used to influence or control another person's behavior for one's own advantage.
Polite Manners
Social behaviors that are considered respectful and considerate toward others, often prescribed by cultural norms.
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