I hope this narrows it down a little bit
1. What strategies did humans use to obtain food before the end of the last ice age? Hunting and fishing
How did these strategies change during the Neolithic Revolution? After the Neolithic they learned how to plant
Due to the deaths of most of the population, "ordinary farm workers, who had been forced into serfdom previously, shot up by 50%. More bullion among a smaller population meant more wealth across all classes and because the same land was in use and it was now plentiful, it resulted in technological advances as well." - Hank Campbell (found at Science20.com)
About a third of the clergy fell to the Black Death, making answer a. unlikely.
I never found any information stating Peasants migrated into cities for medical care, making answer b. unlikely.
Lower classes benefited from the Black Death economically, therefore c. is my final answer.
Doctors at this time knew nothing about how to cure disease, they also made little to none advancements. Answer d. is very wrong.
Scholars played numerous roles in the beginning of the italian renaissance but perhaps the most significant is that they spread the ideas of the books that made everything possible.
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D the study of human origins