The figure depicts the outline of a large fairy ring that has appeared overnight in an open paddock, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 metres below the soil surface. 
What is the most probable location of the oldest portion of this mycelium?
Definitions:
Indirect Message
Communication that conveys a point in a roundabout way, often to soften the delivery of sensitive or unwelcome news.
Reinforcing Position
Strengthening or reaffirming one's stance or argument, often in the context of a debate or negotiation.
Guidelines
Set of principles or instructions designed to inform how something should be done or what actions should be taken in specific situations.
Persuasive Message
A form of communication specifically designed to influence or convince the audience to accept a particular perspective, belief, or action.
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