This graph represents the cost and revenue curves of a firm in a perfectly competitive market. 
According to the graph shown,the long-run output decision for this firm is:
Definitions:
ANOVA Table
A table used to summarize the sources of variability in the data being analyzed in an Analysis of Variance (ANOVA) test.
Regression
An analytical method to determine how a dependent variable correlates with one or more independent variables.
Standard Error
The standard deviation of the sampling distribution of a statistic, commonly used to measure the accuracy of sample-based estimates of a population parameter.
Dependent Variable
The variable in an experiment or study that is expected to change as a result of changes in the independent variable.
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