Examine the following phase diagram and identify the feature represented by point B. 
Definitions:
Task System
A labor system predominantly used in the rice and indigo plantations of the American South, where enslaved people were assigned specific tasks to complete each day, after which they had some personal time.
Historical Significance
The importance assigned to a past event, character, or invention, reflecting its impact on history and its influence on future developments or attitudes.
Underground Railroad
A network of secret routes and safe houses used in the United States during the 19th century to help enslaved African Americans escape to free states and Canada.
Historical Significance
The importance or impact that a particular event, figure, or development has had in history, influencing the future or shaping societal norms.
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