Answer:
Leading towards D
Step-by-step explanation:
In this example he was a survivor, however, sailors were also returning and spread the virus. So it could be "B" as well.
Unfortunately, his account is probably fictitious so I can't be 100% sure. Although it was formerly believed that de Mussis had been present in Kaffa and travelled in a disease-laden ship to Piacenza, it has been determined that he probably never left home.