The map shows the Silk Road. A map of the Silk Road. A key shows Land routes in orange and Sea routes in blue. Orange lines go from the southern coast of China north then turn west across central China and Persia. Blue lines in the Indian Ocean follow the coastline from central Africa, Arabia up to Egypt, Persia, India, and China. A blue line also crosses the Mediterranean Sea.

Which statement correctly describes trade along the Silk Road?

Trade did not reach Africa.
Trade was done only via rivers.
Trade reached three continents.
Trade was heaviest in the Mediterranean.