Respuesta :
D is the best answer because Ptolemy was an ancient astronomer who had a great many of works and is considered by today's standards to be a pro-astrological authority of the highest magnitude which is a pretty high and mighty standard considering. Also it just uses Ptolemy and describes him as a highest achievement astronomer and tells his story. He does not tell much about the era otherwise. C could also be a candidate because he is a specific astronomer and it talks about discoveries but A and B are not completely relevant.
Answer:
C-by providing biographical information about specific astronomers and their discoveries
Explanation: got it right in plato