This graph shows the cost and revenue curves faced by a monopoly. 
According the graph shown,the profit-maximizing decision of the monopolist would be:
Definitions:
Average Variable Cost
It is calculated by dividing total variable costs by the total output produced, representing the variable cost per unit of output.
Variable Cost
Costs that change with the level of production or business activity, such as materials and labor.
Quantity of Output
Refers to the total amount of goods or services produced by a firm or an economy within a specific time period.
Total Cost
The overall expenditure associated with the creation of goods or provision of services, comprising both certain and variable costs.
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