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?

Question

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?

Quizplus · Accepted Answer

The Answer of 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?

The Figure Depicts the Outline of a Large Fairy Ring