Read the map. A map titled Spread of Buddhism. A key shows the Birthplace of Buddhism in orange and colored arrows to show how Buddhism spread. Purple arrow: 1st century: spread from India to Central Asia and Tibet, and then to central China. Orange arrow: 2nd century: spread from central China, moving south along the coast to Vietnam. Green arrow: 4th through 7th centuries: spread from central China to Korea and Japan.

Based on the map, how can the spread of Buddhism best be described?

It reached several continents.
It originated in northern China.
It spread throughout Southeast Asia.
It spread primarily to coastal regions.