Answer:
Environmental factor
Step-by-step explanation:
The difference between Mario and Giovanni's career success is the environment they found themselve in immediately after college. Mario de Wealthton traveled back to live in Wealthton, a trading city on the coast of Italy, that has a large population of merchants who were rich enough to hire him to make various art pieces for them, this patronage contributed to his successful career because of the opportunity of being in an environment that could support his dream.
While Giovanni de Nowheresville went back to a small farming town far from the coast of Italy where most of the population in Nowheresville were farmers who could barely make a living out of farming. His surrounding could not influence an impact on his carrer.