Final answer:
Callimachus was well-read and compiled Greek literature for posterity, making option (b) the correct fill-in-the-blank answer.
Step-by-step explanation:
Callimachus was highly regarded in ancient times for his role in documenting and preserving Greek literature. According to historical records, Callimachus was indeed well-versed in Greek culture and literature, having compiled significant works for future generations. Based on this context, the most appropriate fill-in-the-blank completion for the student's question would be: "Callimachus was extremely well-read; he compiled almost the entirety of Greek literature for posterity." Therefore, the correct answer is b) Well-read; Compiled; Posterity. Callimachus was extremely well-read, he compiled almost the entirety of Greek literature for posterity.