The tea plantations in Assam thrive due to:

The correct answer is: d) All of the above

Tea plantations in Assam thrive due to the following reasons:

• Abundant sunshine: Tea plants need at least 6 hours of sunlight per day to grow properly. The climate in Assam is ideal for tea cultivation, with long, hot summers and short, mild winters.
• Well-drained soil: Tea plants need well-drained soil to prevent root rot. The soil in Assam is sandy and loamy, which allows for good drainage.
• Ample rainfall with warm temperatures: Tea plants need an average rainfall of 1500-2000 mm per year. The warm temperatures in Assam (average temperature of 25 degrees Celsius) also help the tea plants to grow well.

In addition to these factors, the tea plantations in Assam are also well-managed. The tea bushes are carefully pruned and fertilized, and the tea leaves are harvested at the right time. This ensures that the tea produced in Assam is of high quality.