Answer:
a.to stop the financial suffering that occurred once the Medidi withdrew their money from the city
Explanation:
The people of Florence decided to end Cosimo's exile and invite him back because they want "to stop the financial suffering that occurred once the Medici withdrew their money from the city."
This is evident in the fact that following his arrest and subsequent exile, Cosimo de' Medici with his skills and knowledge of public finance was greatly missed in the city of Florence as the city's financial struggle continue to show.
However, following Cosimo de Medici acquiring the favor of 'Bernardo Guadagni', for about $25,000, he was recalled back by the people of Florence in the hope to use the money in reviving the city of Florence