Assam was historically connected to Southeast Asia and China through trade routes like the:

The correct answer is: b) Southern Silk Road

The Southern Silk Road was a trade route that connected India, Southeast Asia, and China. It was an important route for the exchange of goods, ideas, and culture. The route was used by traders, pilgrims, and missionaries.

The Southern Silk Road began in India and went through Southeast Asia to China. It was a long and difficult journey, but it was worth it for the valuable goods that could be traded. The route was also important for the spread of Buddhism and Hinduism.

The Southern Silk Road was a major trade route for centuries. It declined in importance in the 15th century, but it is still remembered as an important part of history.

The other options are incorrect because:

• The Silk Road was a trade route that connected China and Europe.
• The Spice Route was a trade route that connected Europe and Southeast Asia.
• The Grand Trunk Road was a trade route that connected India and Central Asia.