What is the author’s thesis? excerpt from Tea

Tea is one of those beverages that people all over the world consume, regardless of culture, time, or age. But how much do we really know about tea? Tea is produced from a plant known as the Camellia sinensis. There are actually thousands of different kinds of tea. The variations occur as a result of the region where the plant is grown, the time at which the tea leaves are harvested, and the processing method. Each variety of tea has its individual characteristics, including different tastes and health benefits.

A. Tea is a common beverage consumed by people all over the world.
B. There is a lot to learn about tea because there are so many different varieties.
C. Tea is produced from a plant known as the Camellia sinensis.
D. Tea is harvested and processed during one specific time of year.