The arrow in the diagram below indicates the direction of solvent flow through a membrane in osmosis. Which solution, A or B, is more concentrated? Explain your reasoning. 
Definitions:
Span of Control
The number of subordinates directly managed by a supervisor or the extent of authority an individual manager has over a team.
Span of Control
Refers to the number of direct reports or subordinates that a manager or supervisor can effectively manage.
Organizational Size
The magnitude of an organization, typically measured by the number of employees, revenue size, or operational scale, impacting its structure and processes.
Informal Communication
The exchange of information and messages between individuals in a casual, unstructured manner outside formal communication channels.
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