Considering the information in this map, why might the Black Death have affected the areas of Britain, Italy, and Palestine earlier than other areas in Europe?

These locations were geographically closer to Africa, where the Black Death was incubating.
These locations were places with large ports where infected sailors were mixing with others.
These locations had direct contact with explorers returning from the Americas.
The climate in these warm locations made the disease more likely to spread quickly.

Question

Considering the information in this map, why might the Black Death have affected the areas of Britain, Italy, and Palestine earlier than other areas in Europe?

These locations were geographically closer to Africa, where the Black Death was incubating.
 These locations were places with large ports where infected sailors were mixing with others.
 These locations had direct contact with explorers returning from the Americas.
 The climate in these warm locations made the disease more likely to spread quickly.