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A pupil of Plato's great student, who developed the system of concentric spheres borrowed by Ptolemy, was this man who advanced the system of epicycles, adding an additional seven, laying the final groundwork for the system adopted by Aristotle and Ptolemy Who was he?

[A].	Eratosthenes	[B].	Callipus
[C].	Diophantus	[D].	Eppipides

Answer: Option B

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