Use the following to answer question: 
-(Table: Coal Mine Pollution) Use Table: Coal Mine Pollution.The table shows the marginal social benefit and cost of various amounts of pollution from a coal mine.At the efficient quantity of pollution,the marginal social benefit of pollution is:
Definitions:
Genetics
The branch of biology that studies the inheritance of physical and behavioral traits from parents to offspring through the transmission of genes.
Frontal Lobes
Regions of the brain located at the front of each cerebral hemisphere, responsible for voluntary movement, speech, and higher order functions such as solving problems, thinking, and planning.
Self-Control
The aptitude to discipline one's affective reactions, cognitive functions, and deeds when encountering enticements and spur-of-the-moment impulses.
Contrast Effect
A cognitive bias where the evaluation of something is influenced by comparisons with recently encountered alternatives.
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