Question

On this map of the Silk Road, what do the colors represent?

The red lines represent mainland trade routes,
while the blue lines represent sea-based routes.

The red lines represent sea-based trade routes,
while the blue lines represent mainland routes.

The red lines represent dangerous routes while the blue lines represent easier routes.

The red lines represent mountainous trade routes,
while the blue lines represent sea-based routes.

Answer 1

The answer is the last one (The red lines represent mountainous trade routes, while the blue lines represent sea-based routes.)