Final answer:
The evidence indicating that Europe was dangerous for merchants before the 1100s includes the Champagne count's guarantee of their safety and the establishment of secure trade fairs, as well as historical accounts of perilous trading conditions with robbers and costly tariffs.
Step-by-step explanation:
The passage from Sugar Changed the World suggests that Europe was dangerous for merchants to travel to before the 1100s. The evidence supporting this inference includes the count in the Champagne region of France guaranteeing the safety of merchants, which implies that merchants' safety was not previously assured. Additionally, the passage mentions that the six Champagne fairs starting around 1150 became a hub for trade, indicating that there was a new and secure opportunity for merchants that might not have been available before. Furthermore, the historical context reveals that prior to these developments, merchants faced perilous conditions such as robbers ambushing caravans and high expenses due to middlemen and tariffs, which made overland trade routes like the Silk Road costly and dangerous.